Dive Saipan
Korean dive shop
Scuba diving and snorkeling on Saipan are deservedly the most popular activities here among western tourists, though gambling and karaoke/hostess bars are most popular among Korean businessmen, as well as some Japanese travelers. Garapan is coastally located, so other watersports abound as well. For scuba divers, the term "Fun Dive" is used for those who have already been certified and just want to recreational dive, while "Taiken dive" is used to designate first-time divers that take classes on Saipan. The same is true for the rest of the CNMI and somewhat so for Guam. While boat dives are available, you can still drive to some awesome dive sights, like Grotto. A cavern dive to open ocean is great. If you go outside, you will need a guide as it is very easy to get turned around outside and lose track of the tunnel back in.
Aquasmith
American/chamorro/japanese dive instructors dive shop located in garapan, across from dfs.tel:233-5055, (http://www.aquasmith.com/). scuba diving/skin diving/spearfishing
Saipan Scuba
(http://www.saipanscuba.com-) american dive guide/instructor/underwater photographer & videographer 670 233-1979 or 670-483-6764
Tripper's Tours
(http://saipanscuba.blogsp...) canadian dive guide/instructor/underwater photographer & videographer with 15 years experience including 7 on saipan 670 285-mike 6453
G.O.D.I.- Dive Shop. Russian, Japanese and English speaking. 1-670-287-0705
For more detailed descriptions of individual dive sites in Saipan, see the Dive sites of Saipan article.
You may also want to check out one or more of the 5 golf courses. Two were designed by Greg Norman, one by Larry Nelson and another by Graham Marsh. The other course is considered a "local" course. There is also a 9 hole course that is great for beginners.
Recently, Segway of Marianas has started renting out Segway Personal Transporters for use in exploring downtown Garapan at reasonable rates.
The Saipan Hash House Harriers (http://www.huffypuffy.com/) meet every Saturday at 3:30PM at the Bank of Guam parking lot in Garapan to run, hike, jog, climb and otherwise trek through jungle, swamps, mountains, and other terrain. It's usually a great way to meet people and see a side of island life you might not catch otherwise.
Trekking and other land-based activities are available on the island. The Forbidden Island, originally occupied by evil spirits and now a bird sanctuary, can be reached by an hour's hike from the edge of the town of Kagman on the east coast. Take a snorkel kit to enjoy the diving area between the island and shore.
Most trekking activities will require a guide.