Here's how we spent our one and only one day in case you are interested and also here's how we decided what to do. // I see some interest in this based on the last two posts.
I spent $5 to access to touringplans.com Universal / IOA touring plans that give different core plans based on number of days, whether you have early entry or not, whether you have express passes or not and give predicted wait times for attractions. I've used them for years for touring WDW, and thought I'd give them a try for Harry Potter (e.g. Universal / IOA). Also, my 19 year old was at both parks in 2008 (before any of the HP stuff was there) and had his own ideas of what was worth repeating (non HP stuff that was there from back then). There are many popular attractions that can take up quite a bit of time that he just wasn't all that impressed with, so that meant his wish list of other things was pretty small. As this was my first visit to Universal since 1989 I can't give you my opinion on whether some of the things he chose to skip are really worth doing or not. I will say many posters think of some of them as must dos. I was happy, though. to go with my 19 year old's judgement, especially since what he wanted to do fit in so well for a one day touring plan. We were offsite with no express pass. Do note, though, that overall crowd levels for our day were only a 3 out of 10 (pretty moderate). It's awfully expensive, but it would be very tempting on a super busy time to do one night in a Universal deluxe hotel to get the early entry and express pass. At this slower / more moderate crowd time though that certainly wasn't needed, and I'm happy that we didn't spend that extra money.
So I started with the Touringplans.com one day plan that hits both parks for offsite guests and just crossed off all the stuff my son didn't want to do. We did everything on our plan (our main interests first), and then did a few extras that hit our fancy. I was first doing a customized plan with touringplans and trying to delete attractions, but that really didn't work too well online. Their software is really better and geared for doing one park at a time except for their special pre-fabricated plans. So I thought my best bet was using their two park plan and just skipping what we didn't want to do. Their core plan by the way looked a little ambitious to me, so I was happy to see us dropping a few things.
The planned stuff
We got there at opening time for offsite and went with the recommendation to hit other popular things you want to do in Universal first while lines are short as onsite visitors are taking advantage of early entry doing Gringotts first thing, so an offsite visitor doing that first thing doesn't really save you much time. The plan had us doing Gringotts and exploring Diagon Alley later in the day, which could I suppose back fire if it breaks down or something like that.
Anyway we started with Despicable Me, Rip Rocket, Transformer's and Mummy. Then we took the Train to IOA (pretty cool attraction) and hit the Dragon Challenge, Jurrasic Park River Ride, Hulk, and then Forbidden Journey. Our only line longer than 15 minutes was Forbidden Journey -- about a 40 minute wait, but you do see the castle which is pretty interesting. Next we took the train back and hit Gringotts -- 40 minute or so wait and explored Diagon Alley shops, watched entertainment, checked out the other little dark alley, Leaky Cauldron restaurant, etc. (spent about two hours here in total on top of Gringott's ride). Here is where the true HP fan I'm sure could spend way more time (maybe even days). That was it for our plan and we were done by 4:30 p.m.
The extras
We were having a great time and my son 19 and nephew 20 weren't ready to go yet // wanted to do another coaster ride and the Universal teacup kind of stuff with their active grandmother (my mom) who at 78 still loves coasters and spin rides (I think their big thrill was to see if they could get grandma dizzy on the teacups). So we took the train back over (now the train wait was up to 25 minutes -- the earlier two rides were pretty quick), and we did Dr. Doom once, Teacups (I skipped), Hulk, and the Universal tea cup sort of thing again (I can't do that one, but lol my mom can.) The non HP areas weren't crowded at all and lines were all 10 minutes or less with thing like teacups being walk on. // Then we called it a night and went back to the condo and meet up with my dad who decided to skip Univeral/IOA entirely. And that was a good decision for him from what I saw. He uses a
scooter at theme parks and has some motion issues and hasn't read any of the HP books or seen any of the movies. His favorite park by the way is SeaWorld. The HP areas were packed with people looking around even on a crowd level three day, and I do not see this as an easy place for using a scooter at all.
Anyway a big thumbs up for Universal/IOA. I has a very low opinion of the place after my visit in 1989, but hey every 25 years or so you should give a place another shot maybe. I found it to be a lot of fun this time and would not hesitate to come back. I'd still only give it one day on my week in Orlando, but hey I'm a huge SeaWorld/Disney/Resort Relaxation Day fan too. I see a ton of people even doing Universal only vacations and lots of recommendations to hit the Universal parks for three days. We were really happy with our one day though. // My husband who doesn't care for theme parks or Orlando didn't even come to Orlando, but DS is trying to talk him into coming for a little while on our next visit, so he can show him the HP areas -- DH does love the HP books and has read them all at least twice / thinks they are so well written. He's seen all the movies too, but says he in his own imagination sees thing differently than what was portrayed in the movies and is not interested in someone else's recreation. If anyone can talk him into going, though, it will be my son, and DH was pretty impressed with some of the photos DS took of the place and DS's descriptions of rides and places.