I watched him climb the tree and then felt like he was thinking "OK, what now?". It took him a while to figure out how to get down, but unfortunately most of the action was on the other side of the tree. This young fellow was a little over 29 months old at the time and he lives at the Oakland Zoo with his brothers. (Triplets)
It has come to my attention that it looks like he is just standing by the tree. Actually, he really is quite high (for a young lion) so I shot this picture of the tree with my phone to give you an idea of where he was exactly.