Most diving takes place near Bunaken and Manado Tua, because of the many excellent sites. The following are representative of  dive spots in the area.

Lekuan Walls (I, II, III)
This long wall at Bunaken is divided into three sites: the Lekuan I, II and III. Together they are the park's best. Steep walls are marked with deep crevices, sea fans and giant sponges. The shallows are filled with fishes. The wall, often protected from stronger currents, is frequented by bumphead parrotfish, turtles, and Napoleon wrasses.

Mandolin
Mandolin has a knockout reef crest and a wall that attracts thousands of fishes like schooling fusiliers, surgeonfish, unicornfish, and bannerfish. They are used to divers and are easily approachable.

Bunaken Timor
There are strong currents and lots of fish on this long wall. The shallow reef isn't as spectacular as some but there are turtles, sharks, eagle rays, and other big fish in the blue. Overhangs and small caves mark the wall.

Tanjung Kopi
Tanjung Kopi is a nice wall with a small school of barracuda and lots of sweetlips. Visibility in the shallows is not terrific but the numbers of fishes make up for it. Nudibranches and fire gobies are easy to spot here.

Siladen Island
Siladen has a beautiful wall of soft corals that bloom when the current is running. The shallows are nice with lots of fishes and schooling snappers.

Muka Gereja
Muka Gereja is a pretty site with thousands of fishes in the shallows and deeper canyons that lead to the wall.

Barracuda Point
Barracuda Point, on northwest Montehage, is one of the furthest sites. A school of giant barracuda are regulars along with jacks and tuna.

Manado Wreck
This 60m (200ft) long German merchant ship sank near Molas Beach in 1942. It sits upright with the bow at 23m (78ft). The ship is split near amidships back to the stern, exposing the wheelhouse and cargo holds. Dives finish up on a nearby shallow reef. Expect 10-15m (30-50ft) visibility.

Other than diving-enthusiasts, ornithologists and amateur bird-watchers might find visiting Tangkoko Dua Sudara Nature Reserve entertaining.