Just universal... No kids... ?

[theriler]

May will be slightly different, but as a guide of how much you can get done at Universal on a quiet day we went on Oct 31st this year. We entered the park about 08.30, we left about 14.30. In that time we rode Gringotts, Hogwarts Express, MIB, Simpsons, Mummy, Transformers, Jimmy Fallon, Forbiddon Journey, Jurassic Park, Sprider Man and The Hulk. We were also in the queue for Kong for 25 mins before it broke down. We also stopped for a lunch at Hogsmeade and whilst we did rush a bit, we still stopped to look around areas and shops as we were with somebody that had never been before.

If May is anywhere near as quiet as this then you could get away with a 2 day ticket I would imagine. Im not sure on currently, but there are promotions at various points of the year where you can get 2 free days when you buy a 2 day ticket etc. That should give you plenty of time to do both parks at a slower pace and Volcano Bay and be a bit cheaper than a 14 day ticket.