Hòn Mun island boat trip, Nha Trang

Nha Trang bay is scattered with islands, and day trips by boat visit several of them. The highlight is Hòn Mun, part of Vietnam's first marine protected area, with the best snorkelling and diving near Nha Trang, among corals and tropical fish.

The party-boat island tours, with lunch, a floating bar and music, are famous; they're fun and cheap, but often involve a lot of drinking and swimming, so take care, and keep valuables in a waterproof pouch. For serious snorkelling or diving, go with a dive centre instead. Tours are sold everywhere in town and usually include hotel pickup.