Nap time troubles in the big boy bed

Jack has been sleeping in his big boy bed with no problem at night. He never gets out of it and we don't hear a peep out of him until the morning when we can usually hear him singing or chatting away to his stuffed animal friends. We do have a gate at his door, only because the stairs are right there, but he's never even tried to open his door to wander.

Nap time is a completely different story. He can be so tired and ready for a nap, but as soon as I tuck him in and close the door, I hear him get up and play or pull his books off the shelves. He does entertain himself for awhile, but I was getting tired of his crankiness in the evening if he didn't sleep during the day...The last straw was finding him asleep on the floor, which told me he obviously needs some real shut-eye, so I started putting him in the crib for naps. Each time I've done this he's slept for at least 2.5 hours! He's gone into his crib with no problem, but today he refused and he seemed extra tired, so I thought I'd try him in his bed...I could hear him playing up there for about an hour, and now it's quiet...I wonder if he made his way back the the bed, or if I'll find him on the floor again...If it's the floor, he'll be back in the crib tomorrow...

Just a random shot from our weekend adventures...