At Disney’s Aulani Resort &Spa at Koolina, the colorful reef fish in Oahu’s only human-made snorkeling lagoon are doing more than just swimming about looking pretty for the hotel’s guests.

KAPOLEI, Hawaii — Snorkeling is a popular activity when visiting Hawaii, but can be subject to weather, unpredictable currents, and low visibility. At Rainbow Reef at Aulani, a Disney Resort and ...