If you are using the iNaturalist app, one easy way to do community science (citizen science) is to contribute to ongoing research efforts. The Pollinators in Paradise iNat project is one that you can contribute to understanding Hawaii’s pollinator community. It is focused focused on bees, wasps and sawflies and hopes to spread awareness of Hawaii’s endangered pollinator species. Follow this link to join the project.
Seven species of Hawaiian yellow-faced bees are currently listed as endangered under the US Endangered Species Act. The listing below provides links to the USFWS ECOS system that provides summary data on these bees. Five of the seven are reported from Maui county and two are know only from Maui County. The last listing for Hylaeus mana provides a good overview/description of the group that is lacking for the other species. Here is a nice article from the Maui News that gives a nice big-picture overview.