I think you are trying to go too far in. You should never encounter Wind Bats on your way to the tombstone. Take a look at
this map. They have your tombstone pointed out on the first map. It's in the middle of a mini-maze. The map also shows how to get through that mini-maze.
Be careful when going to the tombstone at night, as lots of Enchanted Bones like to hang out there. Hopefully the Spook campers will have slaughtered them, though.