Any other rides that you think will be a short wait?
In my personal experience, if you get to Universal Studios right when it opens, you can walk on pretty much everything. Do Rip Ride Rockit first, because it has a low capacity yet a great curbside appeal which keeps its waits very high throughout the day. From there on out you could hit pretty much anything else. I'd guess that during Thanksgiving week, things will start getting busier around an hour and a half after park opening, at which time you should do the back half of the park (The Simpsons, Men in Black), or start seeing shows. In that first hour of the day, do HRRR, Transformers, Mummy, etc. By the time you're planning to leave rolls around, you should have done a good majority of the park, and your day with Express will help you fill in whatever you missed :thumbs:
If you're planning to do IOA, I would actually NOT go to Harry Potter first thing in the morning (that's so cliche
). Instead, I would do the rides at Marvel Superhero Island. Since you are planning on heading back to your hotel around lunchtime, hit the water rides at around 11 am...people won't be getting on them because for us Floridians Thanksgiving weather is too chilly to get wet in, and it won't matter to you since you'll be able to change. Do Harry Potter when you come back to the parks for dinner or whatever you were planning on doing, because during the last half hour or so of park operation, the WWOHP is very do-able (this is my advice even for the two days you have Express, because FJ does not honor it).
And again, you can fill in whatever you missed when you have your Express. It's great that you will have that for at least part of your vacation, because Thanksgiving has the potential to get pretty crowded.