The largest pit houses the commercial Fish Eye Marine Park tourist attraction, which includes a wooden pier to a underwater observatory and a Seawalker tour of the lagoon bottom.

[1] The Piti preserve is the most ecologically diverse of Guam's five marine protected areas (MPAs), which was the driving factor why it was selected as an MPA site in 1999.

[6] Unlike Guam's other marine preserves, no fishing of any kind is permitted by default between the Piti shore and outer reef margin.

The study found that the Piti Bomb Holes Marine Preserve spillover into the unrestricted fishing area of neighboring Asan Bay for convict surgeonfish, honeycomb grouper, yellowstripe goatfish, orangespine unicornfish, and little spinefoot was +14.1%, +7.5%, +30.8%, +25.4%, and +23.7%, respectively.

[11][12] After a 2020 arrest, Agriculture Director Chelsa Muna-Brecht stated, "The preserves exist to help our reef fish stock replenish, to help our corals recover and thrive, and to ensure our waters are a healthy habitat for our marine life.

[16] The pier also provides access to the Guam Seawalker business, in which customers put on surface-supplied helmets to look at sea life underwater.

[17] The area around the underwater observatory is a snorkeling and recreational diving site, referred to as Fish Eye, Fisheye, or Piti Bomb Holes.

Due to both the many inexperienced diver groups and the feeding conducted at both the observatory and Seawalker locations, local fish are not as skittish as usual.

[citation needed] Entry is typically done from Tepungan Park, walking or snorkeling out along the right of the pier for 75 yards (69 m), depending on tides.

The number of divers at Piti Bomb Holes increased dramatically after access to a third location particularly suitable for dive classes, Outhouse Beach on Apra Harbor, was restricted in 2001.

The threshold at which coral damage can rapidly accumulate is 4,000 to 6,000 dives, putting the area hosting the vast majority of divers at severe risk.