Boomerang World — Sandra McDonald

Tom Carter wants to go home. He's a 25th century American space jockey stranded far from home, and being homesick means taking chances. On the orbital vacation islands of Boomerang World, his one chance of passage back to Earth hinges on rescuing a sea princess who doesn't want to be found. With the help of military officer Nona Tiare, a selkie with plans of her own, Tom might just succeed--and fall in love. But in a land built to resemble old Hawaii and at the brink of interstellar war, choosing love and duty might lead to a tragedy Tom can never undo . . .