Nusa Penida

This is day-trip diving, run at speed. Fast boats leave Sanur early, cross the Badung Strait, which can be genuinely rough, and fit in two or three dives with surface intervals spent bobbing offshore or pulled up on a beach. Operators based on Lembongan and Penida itself cut the crossing out and reach the sites in minutes. Entries are usually a backward roll straight into moving water, with the boat picking divers up wherever the drift leaves them.

The north coast is the workhorse: sloping coral reef running parallel to shore, dived one-way with the tide, and usually the calmest option. The west is where the cold water arrives and the character changes completely. A thermocline shows up as a visible shimmer, most divers add a hood or a thicker suit, and the chill is unpredictable, sitting shallow one day and barely appearing the next. The south and east face open ocean, so Manta Point and its neighbours get moved or cancelled when swell and surge build.

Two encounters drive the traffic, and both come with etiquette that guides take seriously: stay low and still at the manta cleaning station rather than swimming at the animals, and at the sunfish sites keep your distance, skip the flash and let the fish leave when it chooses. Popular sites get busy with boats, so early departures matter. The convenience is deceptive, since the current runs hard and can push downward, and this is a poor choice for a first ocean dive despite being an easy day out from Bali.