I thought it might be interesting if there where lakes or oceans with islands in the middle that you could swim to or make special platforms to build boats by them. I know this sounds impractical as the planets are quite small but if there was a good enough reward at the bottom of these oceans or on the islands it might just be worth it, there could even be sea creatures and ruins of spaceships.
My only concerns -
this might cause some lag when using the terrain tools as the water would have to flow in the gaps
anyway it would help me if you guys could give me feedback, Thanks