All roads to Naantali lead via Turku, which is just 17 km away. There are frequent buses (Turku local buses 11 and 110, 30 min, €3,80), but passenger train service has been terminated.
Much slower and more expensive but far more scenic is the Ukkopekka steamship twice daily direct to old Naantali and Moomin World. The journey winds through the gorgeous Turku archipelago and takes two hours each way (20/25€ one-way/return, operates June-Aug only).
FinnLink also operates daily car ferries to Kapellskär, Sweden. This is the shortest and cheapest way across with a vehicle (60 Euros including driver), but the ferry is considerably more bare-bones than the floating palaces that operates out of Turku to Stockholm.
Naantali is very much a summer town, and many attractions are closed outside the June-August peak season.
Moomin World (Muumimaailma), . One of Finland's most popular amusement parks, dedicated to Tove Jansson's lovable Moomin characters (huge in Finland and Japan, but not too well known elsewhere). The blueberry-coloured Moomin House is the main attraction. Tourists are allowed to visit freely all the five storeys. Hemulen's yellow house is situated next door to the Moomin House. It is also possible to see Moominmama's Doughnut Factory, Fire Station, Pancake Factory, Snufkin's Camp, Moominpappa's boat etc. in Moomin World. Visitors may also meet Moomin characters there or the Witch in her cottage. Moomin World isn't a traditional amusement park. There are many activities and fantasy paths for kids there, e.g. Toffler's Path with Witch's Labyrinth, The Hattifatteners' Cave and The Groke's House. There are also performances in Moomin Theatre Emma. Moomin World is the world's 4th best theme park for children according to The Independent on Sunday (October 2005). Moomin World was also elected as the domestic travel destination of the year 2005 (Matkamessut, Finnish Travel Fair 2006). Moomin World got the Golden Pony Award 2007 by The Games & Parks Industry magazine. The Jury said: "Moomin World is welcoming, well themed and full of educational contents." The Moomin Bus (Muumibussi) connects directly to Turku. Note that the park is open only in the summer (Mid-June - Mid-August). The nearby Väski Adventure Island is also a special sight for children.
Kultaranta, . Literally "Gold Coast", this is the summer residence of the Finnish president. Guided tours Jun-Aug daily except Monday, advance booking required.
Convent Church (Naantalin kirkko). Built in 1443-1462, this is the oldest standing structure in the city and among the oldest anywhere in Finland. Open daily 10 AM to 6 PM May-Aug, Sun and Wed noon-2 PM Sept-Apr. Free entry.
Naantali Spa Hotel, . Finland's largest spa with roots dating back to the 18th century, even the Russian Czar has paid a visit. The resort includes a multitude of restaurants, a variety of rooms and large spa, beauty and pool services. The spa is the only Scandinavian member in the Royal Spas of Europe - affiliation. The resort is also well known in Scandinavia for arranging conferences. Off-season weekday rates can drop as low as 69€/person but climb dramatically in high season.