casino windsor is over rated (unless your not 21 yet) mgm, greektown and the motor city are far better casinos and he wont have to spend 5 hours waiting to get over the bridge or threw the tunnel to get there.
but the casinos, motown museum, they have done some nice things with the riverfront, henry ford museum ,greenfield village ,holocaust memorial just to name a few. where in the detroit area you going to be exactly? cuz that would help find things to do more localy and all. if your in the royal oak area just hit downtown royal oak park and almost any business you walk in at night youll have fun. what kind of things you looking to do also?