That was a REALLY hard question for me I go every year so obviously by now I don't pick favorites so I would say do all three rides because they are all awsome what I say is you do every ride once and if you didn't like a ride you never have to go back on. O and also don't forget to first thing when you get there go around to get fast passes all three of the rides you listed get packed pretty quick I would know I was there two days ago. And last but not least if you are going to MGM studios as well don't forget to try tower of terror it's awsome
Save splash mountain for last! So when your hot after the long day you can get splashed with water to end it off! And if you ride space mountain make sure your keys and phone are somewhere safe!! Long story short, my parents lost the keys to our house on da ride! Had to take taxi! Soo yea!