Depending on the make up of your group, the Kennedy Space Center is a great option. Our flight left at 5:00pm so we drove directly from the port to the Space Center and spent about 5 hours there. You need an entire day so it would be perfect for you. We had me, DH, DS 8, DS 8 and DS 5, plus MIL, FIL. I wouldn't recommend it for much younger than this, my DH and FIL enjoyed it far more than the rest of us!