All of those are great rides.
Space Mountain is my family's favorite. A great indoor coaster that offers some good thrills, but not too rough and no loops.
Rock N Rollercoaster is another good coaster, but faster with loops that go upside down from the very beginning. Also, you are catapulted at the start to get you going, it provides a great rush but can take your breath away.
Test Track is fun but can be a little rough as you go through a simulation of how they test out new cars' performance. You even go through a heat and cold endurance test, but it isn't uncomfortable. The big rush comes when you zip along the track around the outside of the building reaching speeds of 65 miles per hour...the fastest one at WDW.
Big Thunder Mountain is more of what you'd be used to experiencing at a Six Flags or other park. A good coast with lots of twists, turn but no loops. Good theme and lots to see as you go zipping by outside.
Spash Mountain is an easy ride, and you get to see all the characters from Song of the South, B'rear Rabbit and Bear. You wind in and out of the mountain on your way to the top while getting to see the animatronic characters. The drop is steep, but not too bad...at least for adults. You will get wet.
Tower of Terror is another family favorite. They have just changed the programming, so the computer determines how each elevator will react and what drop sequence it will use, so you can ride it several times and get a new experience each time. You could drop immediately, or go up and then drop. You do go weightless for a few seconds and may come up out of your seat, but the lap bar keeps you safe.
Hope this helps and you know these are based on my opinions....and I'm a big fan of thrill rides.
