I have built a convenient little XP grinder near Spawn Village. It’s not overly automated at the moment, but it provides a safe and convenient way to kill a lot of zombies. In the chest there are some extra swords and the like. Zombies now have a random chance to drop a tool or a sword, and I put the ones they dropped in there so you don’t have to use up your “main” weapon if you’d rather not.
It is probably best if you don’t break the glass. :) Also, I left a gap at the top of the glass so they could see you and drop into the “killing” box instead of wandering around aimlessly. Sometimes I jump up and down a bit to get their attention. Happy Zombie slaying!