Cave ideas

I think the new caves should have more under ground structures with cool and new loot. Also the current structures like mob spawner dungeon, mineshafts and strongholds are pretty dull right now and should be updated too. Having more and maybe bigger structures under ground would make it a lot more interesting. There should also be more light sources underground other than the occasional glow lichen that doesn't really help to show the player what is roughly the shape of the cave. Either give a lot more glow lichen in the caves, have some other block to emit light, or have light fog to show the outlines of the cave.