Mokupoe (pronounced “moe-coo-poh-ee”) is the name of both the world the party hails from and its people. Mokupoe (the world) is largely aquatic, dotted with archipelagos and the occasional small continent. As a result, the Mokupoe (the people) are accomplished sailors and well used to making long, dangerous journeys. They’re also well-versed in magic used to aid in such expeditions, incorporating it into both active spells cast during travel and passive magic used to construct ever-better ships and equipment.
The culmination of this research is the Lanikaula, a highly magical structure that gave the Mokupoe access to other worlds. Atop the Lanikaula sits Kaonakala, a city built above the sky itself, which acts as the base of operations for the Mokupoe spelljamming effort.
Mokupoe is a remarkable heterogenous civilization — it’s made up of members of virtually all intelligent races, which all get together reasonably well. As a consequence, it’s very very boring there, with little need for adventurous derring-do. That’s why you get to be awesome in space instead!