Pohnpei is a tropical Micronesian paradise that lies far from the trodden tourist trail. One of the rainiest and most remote places on Earth, the jungle-clad speck of green is a Garden of Eden that tourism forgot. But for avid explorers and lovers of off-beat destinations, Pohnpei offers a diverse array of things to see and do—both above and below sea level. From ancient ruins to pristine mangrove forests and from gushing waterfalls to remote atolls, the Micronesian island is a wonderland of undiscovered gems.  I visited Pohnpei with my…