I don't think it's unreasonable for your coach to not want you doing anything that could risk an injury. Last year we had a girl who slept wrong (yes, SLEPT WRONG) and woke up Sat morning unable to turn her head. Thank God for alternates! Coaches don't need athletes staying up late in the parks, drinking their way around Epcot (if they're 21), or play stunting in the pools and getting over tired, hungover or hurt. You can do that after the comp.
I don't know if they have the connectors in the rooms to play Wii. You could always call the hotel directly (I'm sure you could find the number online) and ask.