Sorry to be a bit of a noob here, but there are some mods in this pack I haven't encountered and Google is failing me. When I started a new world with this pack yesterday, I flew around with Creative flight to get some idea of what things were like before starting a for-keeps world. There were a few things that I don't know what mod they are from or what they're for. They are: platforms on the ocean with end portals on them, floating islands with dungeons on them, and LOTS of underwater ships. Can someone point me in a direction regarding those?
Also, as general advice, are most people starting out by building in the ocean? It appears safe-ish.