In Bali, you will probably point to the beaches near the airport: Kuta and Seminьяk, there and rent out bikes. Well, if we talk about a place far away, just worth going to Uluwatu (The above-cast), good waves are on Balangane (Balangan). You can relax in the cool Sanur (Sanur) and Nusa Dua (Nusa Dua). In general, should take a moped and try to travel as much as possible, and to find the best beach for yourself.