Dive
Steffen Sea Sports
Newest diveshop around. Offers a more customized, relaxed and professional atmosphere with 31 years of experience. Owner is a great Malaysian guy that truly appreciates his customers and it shows in his attitude also. They had nice plans for future in Spring 2010, but are operating from Gapang near Leguna and Flamboyan resorts at least until 2011. Gear is new too, and maintained to strict standards. Highly recommended.
Lumba Lumba Diving Centre
Popular western-owned dive operator in Gapang beach. Offers accommodation for divers only. If you want something else than diving and hanging around with them 24/7, or tend to be more price-conscious, consider the other options too.
Rubiah Tirta Divers
Dive school based in Iboih, with alot of resturaunts and accomodations nearby. Has a big boat and two smaller boats, nice staff and knowledgeable instructors. Local coconut artist Andy Coco works here as an instructor.
Other
Snorkeling - Lots to see including octopus, turtles, morays....Nothing - nice place to do nothing as well :) - Rubiah Island Sea Graden off Iboih is AMAZING even for snorkelling and you can start at the southern end and float along in the currents to the northern end. You could hire a boat with driver for the afternoon and should not cost more than 150,000. Must do.
Learn Indonesian. Speak to Eva in Iboih beach