no unflooded caves and a lack of mobs

I can't find any caves that haven't been submerged in water of witch makes it impossible to get recourses without a door or something.
the second problem is that there are no mobs, I'm talking about friendly mobs like caws and sheep's, i can find the hostile mans. but when I look for ages and by the time I see something in the distance, I'm dead.

 

 

there's also some floating blocks in areas that aren't known to have common floating blocks in the area