Moab is a unique Western community situated in the red rock country of Southeastern Utah on the Colorado River. Arches National Park is only six miles from downtown and Canyonlands National Park is 32 miles from Moab. The city is surrounded by public lands which are used not only for grazing, drilling, and forestry but for recreation such as mountain biking, hiking, rafting, rock climbing, and cross-country skiing. Because the area is rich in these recreational opportunities, Moab has become the hub of tourist activity and services.
If you are approaching Moab while driving west along I-70, it is highly recommended you use Utah route 128. About 10 minutes past the Colorado-Utah border is exit 214 on I-70, it is marked as "Cisco". The landscape at this point is extremely dry, slightly hilly. The road is narrow (no shoulder), and somewhat curvy, and it's about 80km to Moab. About half-way, the road narrows, meets then crosses the Colorado River, and the remainder of the trip is spent with the river on your right side and spectacular canyon walls surrounding you. This piece of pavement is, in the opinion of this writer, one of the best drives in North America. Optimal times to take it are the morning (~9am) or afternoon (after 3) for the light -- do not drive it at night (you can't see anything and more dangerous -- use US 191 instead). Watch for traffic, particularly bicycles as you approach Moab. The urge to rubber-neck is extreme, and needs to be resisted: be a passenger if you can. Eventually, UT 128 ends at US 191, a few minutes north of Moab.
Slickrock Bike Trail On Sand Flats Road, 2.3 miles from the intersection of the Sand Flats Road and Millcreek Drive in Moab. One of the most famous Mountain Biking trails in the world. 
Mill Canyon Dinosaur Tracks Along this nature trail, which requires a moderate 1/2-mile hike, Morrison Formation dinosaur fossils and petrified wood may be seen in a natural setting. The trailhead is in Mill Canyon on a dirt road, accessible by passenger vehicle, off U.S. Highway 191, 13 miles north of Moab, Utah (near mile marker 141).
Museum of Moab This 50 year old museum is a hidden Gem in Moab. Located a little of main street the museum specializes in the history of Moab. With exhibits on Geology, Paleontology, Mining, History, Anthropology, and much more the Museum of Moab provides a cool after noon of fun. 
Moab is home to the Semi-Annual Jeep Safari, which can give you some wild rides with difficult obstacles. Go 4-wheeling on the trails that stretch just outside the city. Many trails are a less than a few miles away, while some may take a short while to find and can be tricky. Trails rank from easy to difficult.
River Raft - Moab lies along the Colorado River and offers excellent opportunities to get out on the river. The most popular option is a one day trip on the Fisher Towers section. Also know as the "Moab daily" this 14 mile stretch of river is perfect for families with children or anyone wishing to escape the heat. Slashy and fun this is a wonderful way to take in the beauty of Moab from a different perspective. Trips with a local outfitter like Red River Adventures typically include a lunch and run from 8:30 to 3 leaving plenty of time to do something in the evening.
Colorado River and Trail Expeditions offers rafting trips ranging from 1 day to 7 days. Their most famous expedition is their Canyonlands National Park Rafting/Hiking Tour.
Farabee Jeep Rentals Offers Full or half day Jeep rentals for 4X4 adventures or spectacular sightseeing. 401 North Main Moab, UT 84532
Slickrock Jeep Rentals 900 South Hwy. 191 Moab, Utah 84532
Cliffhanger Jeep Rentals 1551 North Hwy. 191 Moab Utah 84532
686 South Main St. Moab, Utah 84532 Great food and great beer. They have a separate dining and bar area. Billiards and TV are available in the bar area. The Black Raven Stout is to die for.... On weekends get here early or prepare to wait.
57 Main St Moab, Utah 84532 Great Bottled Beer selection and beer on tap.
In summer time, Moab can get very hot. Drink extra fluids as needed. If you plan to go off-roading or camping out on the trails, take at least one gallon of water per person per day.