I was at this island for almost 3 weeks (spent 4 days island hopping out of the 15). This island is not as ‘nice’ as Guam in appearance but it does offer a lot of snorkeling & scuba opportunities. (Location: Saipan)
It’s part of the country the Commonwealth of the Northern Marianas, which is protected by the US, so US citizens can travel here (flying though Japan) without complications, Canadians too, requiring only their passport.
The Language is English, Currency is USA dollars.