Since you're a single you might want to try the fast boat tours to Lembongan that are all-inclusive. I have never done that, usually I go with my own group and we rent a boat. However, I see the "tour" groups and they look like they are having fun. Lembongan snorkeling is pretty good too! When you get to Bali you will see brochures in the airport and at your hotel offering these tours. Easy to book on the spot.
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