The Universal onsite hotels allow 5 to a room and you get front of the line access to most of the rides in both parks plus early entry to the WWOHP. If you desire more comfort you can try renting from one of the timeshare resorts like Hilton Grand Vacation Club. You can get a beautiful, spacious 2br suite. Odds are you'd have to book directly through Hilton because you'd be hard pressed to find an owner willing to rent only one day.