If you want the best experience for yourself, you need to get there for Early Park Admission (which means booking at least one night on-site) get done with things like Krakatau and the body slides as those are low capacity. While you are doing that, pick up some return times with your Tapu-Tapu. and do some of the big raft rides. There will also be many rides that are "ride now", which you can ride while waiting for what you have tapped for on your Tapu. Then you'll be able to relax for the rest of the day once crowds are at their highest.
PRO TIP: Make sure you set up an account on the Universal app and add in your credit card ahead of time if you plan on using the Tapu Tapu for purchases. It's not overly easy to set up on the fly if you haven't looked at it a little bit and it's 100% necessary that you have an account anyway. This will save you from wasting time on this and potentially having to go to Guest Services if you really can't figure it out.
Lastly, there are many concierge huts around the park. If you ever have questions, they likely have your answer!