Paradise Island, in
Bleia Dryiae BH-S D5-30, a system filled with wonders. Here, you can find any materials you're looking for, and while you're at it you can stop by this dancing trio of beautiful ringed worlds. One of them hides a very particular secret! Get in close and you can see this equatorial island. Go on, look closer, it's there. Hidden by the rings of the planet, there is one tiny little white dot on the surface of this otherwise impossibly blue orb. But don't be deceived, this planet is massive! That island could very well be home to a large population, but given its gravity, they'd have to be Amazons.
(Paradise Island is on Bleia Dryiae BH-S D5-30 A 8) You might have to wait until a certain time of day though, because it's hard to see anything that tiny at night!
(on a more serious note, the planet has no atmosphere and couldn't be home to a land population. Could have mermaids though! The other water world in the dancing trio does have an atmosphere though. It would be a slightly cold world with maybe a few islands, and any of them near the equator might be decent temperatures for humans. Would be a very high pressure world though, and at 2.21 G, you'd have a rough time walking around on your boat OR on an island)