This is a question that probably applies to all resorts but we're (5 of us) staying at BWI in early June for 7 days. For 2 of those days we have a family member who is staying offsite and is planning to tour the parks with us. He has his 2 day park hopper so is all set on that front. My question, is he permitted to park at BWI (he is renting a car) and travel with us using the bus service?