We were at Universal Sat. Aug 2 and did two parks in one day with three boys (7,7 and 5). We stayed at the PBH so we had FOTL. We started at IOA since I saw they opened IOA for both parks at 9 pm for the fireworks show. I also thought since IOA closed later, US would be busier in the am.
DH walked onto Hulk, while kids and I rode spinning ride next to it. Got off at same time and walked by Fearfall(mistake should have ridden then since they close it in the rain). Rode Spiderman with no wait. Went to Jurassic park and rode River Ride Rode Flying Unicorn three times,and DH went on Dueling Dragons. Off to Posidons's Fury and then Seuss Landing. Cat and the Hat and One Fish Two fish, Kids played in the Zoo Playgraound for about 30 minutes and then we headed back to Jurassic Park since some of the things didn't open until after 10. We did the Discovery Center and Tricerotops Encounter and ate lunch at Thunder Falls (longest wait of the day!!). After luch we rode the two water rides and got SOAKED, not a little, but completly SOAKED!! Then the rain started anyway, so it was okay! Started to exit and decided to ride Spidey one more time and then walked to US in the rain by 3 pm.
US in the rain. Jimmy Neutron first, then off to Twister. Jaws was down in the rain, MIB, then Back to the Future, ET, Terminator and then Shrek. We left US by 6 even though it was open until 9 and IOA until 10. The rain wore everyone out and kids were beat, no strollers. I know we missed a lot of shows, but I felt really good about our 1 day visit.
I highly recommend the hotel front of the line. With the express pass you buy you can only do each ride once and you have to get a pass for it at at a particular time. With the hotel it's unlimited and you just walk right up anytime you want.