I just stumbled upon what has to be the most amazing collection of Minecraft mods ever. It's called Hexxit and it has a vast assortment of new dungeons, mobs, weapons, armor, crafting materials, and all sorts.
I also think I'm somewhat lost. No, not in the sense of not knowing where I am. I have a reasonably good sense of direction. It's just that there's so much stuff.
It's worth giving it a try!
Want a taste? How about the minotaur or, better yet, the minoshroom?