Snorkelling: rent your equipment at Samloem Laguna Resort and explore the underwater life on your own. Ask the staff for good places to go.
Diving: The dive center will pick you up at Samloem Laguna Resort and take you for a day trip around nice diving places. Have a try dive or head for a complete PADI-license. If you are an experienced diver you might be interested in a night dive. You can also go along with the boat just for snorkelling.
Kayak: Rent a kayak and find your own beach somewhere hidden by the jungle. This is the perfect activity to discover the island from the waterside.
Paddle board: Rent a paddle board at Samloem Laguna Resort and go around the Saracen bay, while you improve your sun tan and get some exercise at the same time.