The coastline of Pohnpei is covered in pristine mangrove, so there aren't that many beaches (if any at all). But for some island life and snorkeling, go to some of the smaller islands, either for a day trip or longer. Lenger, Nahlap and Laiap (Rainbow) islands are some of the options. Rainbow is a tiny island, which is privately owned by Cliff Hotel. There is one concrete building on the island, else it's just trees and a coral covered beach. The journey to Rainbow Island starts with 45 min drive from Kolonia, and then a boat trip through the dense mangrove, before reaching the sea with Rainbow island in the horizon. The caretaker family will come along and do some spear fishing, so you have something for lunch.