M.L.
what i did with my kids, boys or girls at that age was, make them sit on edge of their bed no toys, no playing just sitting for length of time of their age. it is like a time out but, they can see their favorite things but can't touch. if that didn't work i took their favorite toy away for a certain amount of time. ages 3-4 are a tough time they want to know what everything under the sun does, and to see just how far they can push your buttons. also if they did get off the bed before i said it was ok, they had to sit longer. they had to sit alone though. at that age you have to come down to their size, not above them. otherwise they feel like your bulling them. but keep your voice stern, if a child hears a waiver in your voice at all they will take advantage of it quickly.