A small fishing boat sounds infinitely better than the raft. Karve already exists of course, but it's not the same thing as a rowboat...

Waterfalls would be great, but these are probably somewhat difficult to add as an afterthought. They likely couldn't be found in mountains which have already been explored, only on new worlds or seeds.

Hireling NPCs have been denied previously, check the pinned thread in suggestions section.

I think there already exists some world seeds which have specific features. "Pangaea" might be one of them, I'm not sure.