i suck at most games while stoned.
my fav is usually either vice city or san andreas.
i typically just drive around listening to the radio the entire time.
another older game i like was Ultima Online.
it had such a huge map, and the shard i played on didnt use all of it, so there was alot of unexplored territory that had alot of random spawns and unused towns...oh, and one time i found a vendor that sold cookies.
i bought all his cookies and he never restocked.
i was saddened.
anyways, that was a good game for it. i could get stoned, wander around that map for hours on end, occasionally find something cool, and if all else failed, go kill someone that was far weaker than myself.
its the simple things really.