In Hawaii:
King Tides (UH SeaGrant)
Stop the Ant (Stop invasion of Little Fire Ant - on 100 worst invasive species list by IUCN)
Hawaiian Island Humpback Whale National Marine Sanctuary Ocean Count
Bioblitz! (Hawaii Geographic Alliance)
Others: CitizenScienceHawaii.org, Audubon Society, Pacific Whale Foundation
Other Projects:
Marine Debris - worldwide open-data marine debris tracker
Phytoplankton/Turbidity - The Secchi Disc Project
Phytoplankton/Turbidity - HydroColor
MyFOSSIL - Social Paleontology
Others: CitizenScience.gov
References:
Earp H.S., Liconti A.. 2020. Science for the Future: The Use of Citizen Science in Marine Research and Conservation. In: Jungblut S., Liebich V., Bode-Dalby M. (Eds) YOUMARES 9 - The Oceans: Our Research, Our Future. Springer, Cham.