I would get the 7 seater minivan or a standard SUV, but consider sending some of the group to the resort on Magic Express, WITH most of the luggage. (are you staying onsite?)
7 people in a minivan is fine, but 7 people with 7 people PLUS their luggage seems difficult to me. Although, before Magic Express, we did 6 plus a large Convaid (like a WC) chair, which was the same as 7 people space wise, and made it to the resort. Luggage on laps, between the seats, you get the idea. The Toyota Sienna as great, large are in back behind 3rd row.