The unlimited express pass makes doing the parks so easy
If you had one of those I think two days in the parks and park hopper so you can move back a forth using hogwarts express would let you try every ride you love at least twice but in a very calm way.
You would even be able to do ropedrop , return to the Hotel pool in the afternoon then back in the parks in the evening and do everything you want and more in two days with the express passes and a good plan IMO
To get one of those passes you can either stay in a cheaper Hotel and pay for it on top or stay in one of the 3 deluxe hotels (which are also very close to the parks)
All 3 deluxe are good Hotels but I would highly recommend staying in whichever is cheapest for your dates (its normally royal pacific) as you won’t spend much time in your rooms
Having done Universal twice with the deluxe Hotel unlimited express pass I would HIGHLY recommend it
Even if the park was due to be quiet crowd rise it’s so great just going straight on the rides as there’s always some kind of queues to face without the pass
And when using touring plan ap for planning your days just focus on minimise walking rather than worrying about waiting times
Do HP lands first thing with your Hotel early entry in the mornings then maybe return to them in the evenings as well.
2 days would be enough
3 days even better maybe as it’s your first time
But if you plan travel right you can do 3 days with just 2 nights in the Hotel to get universal express pass for the 3 days I’m sure
And you could even stay in a cheap hotel nearby before and/or after (depending on how many days you intend to travel) to keep costs down and just arrive at the deluxe Hotel early to get your express pass and leave your baggage etc.