Nusa Dua is a tourist area in the South of Bali, in the Bukit Peninsula. Here is where the best beach resorts in Bali are; most of them 5-star. The enclave is closed, and the only access is through three security gates.
Nusa Dua is very artificial, but its beaches are the nicest in the island. The complex features a shopping mall with many shops, bars and restaurants. This is the safest area in Bali, and the less interesting from a tourist point of view.