The island does have a few activities to enjoy if the beauty of the beaches. From the simplest of activities such as walks along the beach, all the way through to taking your PADI Scuba Diving certificate, there is an array of ways to keep yourself active.
The island is very small , can easily be done on foot, bike riding or by hiring a motorbike/ATV and driving down the island to visit a few of the smaller more secluded beaches and taking in some of the more naturally forested areas further down to the south of the island.
Mountain Bike Rental - Mountain bikes can be rented from various locations in Ao Noi na and on the main road. Prices are normally 200b for one day.
Motorbike Hire - The island has more motor bike hire shops than any other shops so they are not hard to locate and prices are 300 baht per day for manual or automatic bikes.
Gold Shop - This motorbike hire shop is just up from the national park entrance and 7-11 (opposite Chilli Restaurant). This family take very good care of their motor bikes and ATVs. The owner 'Jep' is a very friendly guy and always willing to help. His son also rents their vehicles from next to the 7-11 by the park entrance and 'Bow' is also very helpful. If you rent for a few days he will often offer good discounts.
Boat Trips - There are several companies on the island offering a variety of different boat trips from around the island on a large slow boat to a 7 island speed boat day trip visiting many of the surrounding islands from Samet. These trips are all a good value but be sure to have a chat before you book and make sure you are getting the trip you want and that they are not talking you into another trip as they cannot do the one you are asking for. Also all trip are dependent upon weather conditions.
Samet Boat Trip - One of the original boat trip families on Samet still offer a daily round-the-island boat trip. If you're lucky it could be a private trip or one with just a few other chilled out people on board. Their fleet consists of 2 large slow boats and 4 speed boats so different trips are available daily.
Scuba Diving - With the calm surrounding waters and coral reefs Ko Samet has something to offer those of all levels of diving, but it is an especially good place to learn to scuba dive with classes nearly always on the smaller side and often one-on-one with an instructor. With depths ranging from 5 m down to 25 m, there is a variety of local sites to dive on and explore and there are also the outer islands that surround Ko Samet which offer stunning coral reefs, such as Ko Talu.
The only diving school on Koh Samet is UDI's Scuba Diving at Ao Phai. Prices: 2 Fun Dives: 3500 Baht, PADI Open Water: 13500 Baht, Advanced Open Water: 13500 Baht