1. Sit in the middle of the boat, in the middle of the row, and you'll barely get wet. Anywhere else and you can get pretty wet.
2. The majority of the Single Rider lines you do NOT get even 10% of the cool immersive queues. For me, it's still worth it, but if you're into queues, you should wait through them.
3. Do Mummy, Shrek, MiB early on as they're some of the longest lines at Universal. As long as you're there EARLY you can pretty much be ahead of the crowd the whole day, and not need to start at the back and work your way forward.