This Pohnpeian man enjoyed watching a pair of local women swim in the waterfall's pool. His teeth were likely stained red due to chewing betel nut.
According to Neil M. Levy, author of Moon Handbooks' Micronesia, "Betel nut is a green nut that's wrapped in a piece of pepper leaf and chewed whole for 20 minutes or so. It produces a sense of well-being, accompanied by light headedness that lasts for about 15 minutes. Betel nut chewing turns saliva and teeth bright red. It's so prevalent in Micronesia that many public buildings sport 'No Spitting' signs."