Realistic survival mods for Minecraft?

I've been modding lots of games recently, and I decided I'd try some of minecrafts mods out. Firstly, I was wondering if there are any survival overhauls or anything like that? It's pretty obvious that vanilla survival is barely survival at all. What i'm looking for are realistic needs, like hunger, thirst, sleep, disease, things like hypothermia, so you have to stop occasionally to build fires and rest up for the night because you're in a cold environment. Mods that generally make mobs more dangerous, and make you fear the night. Mixing that with other things like a mod that could allow me to build an airship and go on actual adventures? I've seen people playing the game before and they could sail around, on their airship and stop off in different places like pirate coves, magical towers and find all kinds of different villages owned by actual NPC's.

Can someone recommend a couple of mods that are like this? I would search myself, but it seems that there's barely anything related to harder survival. I know about millenaire, but I don't know what mod it was that added pirate coves and airships.

Also, while I'm here, I thought I'd say that if there's no hypothermia survival mod, I'd make one myself. Jeb already isolated heat and made it into an ingame feature but he never used it for anything, so I thought I'd try to use said heat to make a mod like that.