We are planning a weekend trip to IOA for May 7-9 for my son's birthday. We will only visit the park on the 8th which is a Sunday (and Mother's Day). As far as I can tell, it will cost us just under $300 to stay one night on-site for the ride access perk. Do you think it is worth it at that time of the year or would off-site be ok? I've never been to Universal or IOA and am not sure how the crowds are at that time of the year.