Nahuel Huapi National Park is in San Carlos de Bariloche, which is a city in Rio Negro, Argentina. Bariloche is one of those places you'll end up staying longer than you planned. Why? it's not for the city's aesthetic appeal, rather it's for the great outdoors and night life. It's the elite honeymoon capital in Argentina. It's the main hub for travelling around the Lake District, the gateway to Patagonia and chocolate capital of Argentina.
For National park information and a good collection of maps, visit Parque Nacional Nahuel Huapi on the corner of San Martin and Morales.
Also Club Andino offers free maps and provide information on trekking area. They sell transfers and trekking packages and you can reserve a bunk there for most of the shelters in the nearby mountains.
At certain access points to the park you are required to pay the Park Entrance Fee of AR$50 (May. 2011). This fee is payable if going to Pampa Linda (Tronador) and if entering the park on a boat excursion; there is also also a AR$11 port tax. Access to the refuges in the National Park around Bariloche are free: Refugio Frey, Refugio Lopez, Refugio San Martin & Refugio Italia.
There is an excellent local public transport system from the centre of Bariloche to Llao Llao, Colonia Suiza and Cerro Catedral. There are tourist buses leaving to Pampa Linda (Tronador) on a daily basis during the summer.
The area is rightly famous for its barbecued meats, Parrillas "Boliche de Alberto" fondue "La Alpina", pizza "El Mundo de la Pizza", trout and deer "familia Weiss". Palacios Street has a lot of restaurants.
Bariloches budget accommodation quickly gets fully booked, so make your reservations in advance, particularly during high season.
La Justina, Quaglia 726, ☎ +542944524064, . Just a Few blocks from the City Center. Big, spacious rooms, cozy common spaces for relaxing,watching TV or DVDs, listening to music or playing games. Free internet and breakfast, a well stocked kitchen, and very friendly owners. They can help you with any tourist info you need, and rent bikes. Minihostels.com members get 10% off.edit
Periko's, Morales 555, ☎ 2644-522326, . Named after the owner's dog.edit
Hostel 1004, Edificio Bariloche Centre 10th floor, ☎ 02944-432228 (firstname.lastname@example.org), . Offers an amazing panoramic view. Excellent public areas, especially the kitchen. Free breakfast, wi-fi internet and has a computer for use but it is very busy and hard to get access to. Won't make reservations if you you are arriving after 2pm.Dorms from Ar$ 35.00. edit
Hostel Refugio Patagonia, Mitre 1338, ☎ 02944-422539, . Feel at home with Tato and Sandra, they're building a big "quincho"/barbecue saloon.edit
Lake View Bed & Breakfast, Pioneros kn 4.6 (5 minutes from downtown), ☎ 02944-1534-1876 Mark. edit
Marcopoloinn Hostel, Salta 422, ☎ 02944-400105 (email@example.com), . Modern, clean hostel. . Free breakfast and dinner, fast internet, WiFi. Lots of party folk. Easily the best value in town.(Nov. 2012)Dorms from Ar$80 (HI members), Ar$85 (nonmembers). edit
Tango Inn Downtown Hostel, Salta 514, ☎ 02944-400004 (firstname.lastname@example.org), . Modern, clean hostel. Dorms from Ar$ 37.00 (YHA members), Ar$ 40.00 (nonmembers). Free breakfast, fast internet, WiFi. Three-star-breakfast buffet (thats the free breakfast!). Very quiet.edit
Grand Hotel Bariloche, ☎ (02944) 430622, . Grand Hotel Bariloche is a 9 storey hotel (3.000m2.), which is located at the main street in San Carlos de Bariloche. At half way in the commercial route of Mitre avenue and only 100m. from the Nahuel Huapi lake. They offer 75 rooms organized in singles, doubles, triples and apartments. Mitre 408 - (8400) S.C. de Bariloche - Río Negro - Patagonia - Argentina. Room rates start at USD $37. edit
Aconcagua Hotel, 289, San Martín Avenue, San Carlos de Bariloche, Río Negro, Argentina, ☎ (00-54-2944) 424718, . Aconcagua Hotel is located along San Martín Avenue in San Carlos de Bariloche, Rio Negro, Argentina. It is near the Civic Center, Lake Nahuel Huapi, and casino. Aconcagua Hotel’s 32 comfortable rooms guarantee a restful stay. Each accommodation is equipped with a central heater, TV, Internet access, and toilet & bath with shower. Rates start at USD $53. edit
Galileo Boutique Hotel, Av. Antartida Argentina, s/n, Base Cerro Catedral, San Carlos de Bariloche, C.P. 8400, Argentina, ☎ +54 (2944) 460-388, . Galileo Boutique Hotel is located along the base of Cerro Catedral in San Carlos de Bariloche, Argentina. Major landmarks, such as the Nahuel Huapi Lake and the city’s Civic Center, are within proximate distance from the hotel. Feel as if you’re in the Swiss Alps when relaxing in Galileo Boutique Hotel’s luxurious Rooms, Suites, and Apartments, each adorned with quaint cypress wood frames and geometric roofs.edit
Hotel Llao Llao - Beautiful alpine style hotel, built in 1939 (recently renovated), adds to the dramatic backdrop of the mountains. A classic resort: there's a golf course, boating, and much for the wealthy to see and do. Nightly rates were around USD$300 back in Dec, 2004, so the $8 peso coffee might be the way to go in order to enjoy the view, the ambiance, etc, without paying an arm/leg to stay there overnight. Excellent service, slightly OTT decor. About 25km from the city centre and about 35km from Cerro Catedral.
Design Suites Hotel, Av. Bustillo Km.2,5 8400 Bariloche Provincia de Rio Negro Argentina. Modern hotel (not all suite as the name might imply), with all the benefits (Spacious rooms, Free Wifi, Stunning Panorama Views, clever design touches) and drawbacks (Awful restaurant, no room service, staff not trained to deliver 5* service) you expect from a Boutique Hotel. The suites themselves are not traditional suites, rather larger rooms with a couch and a balcony. Hotel 3km from the City Center.Best rates on official website start at US$130. edit
Rentals BarilocheRentals Bariloche - Luxury vacation rental apartments and houses in the best locations. From the heart of downtown to the prestigious Arelauquen Golf & Country Club; Lake and Mountain views to quiet forested streets. All these vacation homes are fully equipped including complementary WiFi access to ensure you get the most out of your time here in Bariloche.
Villa La Angostura - A small town about an hours drive from Bariloche, very picturesque, you can also hike a 12km trail to the famous Bosque Arrayanes.
El Bolson - A small hippie town (founded in the 70's) in a mountainous valley about 120km/75mi south of Bariloche. There's a twice weekly outdoor flea market (get there in the morning, it closes down around 3pm). Lunch at "Las Brasas" parrilla is recommended. Transportation on the El Valle bus line  is $24 pesos/usd$8 round trip from Bariloche and is worth it for the scenery alone!