The do have the one-day/two-park pass, which is only sold at
AAA and the front gate, I believe. You could always do Mummy first thing in the morning, then head over to IOA afterwards.
If you want more than just one ride over at Universal buy the 2-day/2-park pass. The second day does not have to be consecutive.
Here's what AAA's website said:
" 2 Day/2 Park Pass Information
Part 1 - The 2-Day Pass may be used for one (1) day at Universal Studios and one (1) day at Islands of Adventure OR two (2) days at Universal Studios OR two (2) days at Islands of Adventure. The 2-Day Pass also allows same day park to park access. Members should call ahead for ticket availability. Valid for one (1) day each at Universal Studios and Islands of Adventure or two (2) days at Universal Studios or two (2) days at Islands of Adventure.
2 Day/2 Park Pass Information
Part 2 - No expiration date on unused days. Pass does not have to be used on consecutive days. Pass allows same day park to park access and only uses one day`s admission. The pass includes CityWalk for 7 consecutive days/nights from the first use of the 2-Day Pass. Show your 2-Day Pass at the clubs for entry. "
Hope this helps!
