With little kids - head to Fantasyland.
If you're a bigger kid - head to Splash Mountain, and on your way, pick up a fast pass for Indy. Once you're off Splash, Work your way back, hitting up Pooh, The Haunted Mansion and Pirates to fill up your time!
If you've got time left, and the line is short, get in line for Indy and be ready with your fastpass to ride it again! Or, hang out at Tarzan's digs (the treehouse). If you don't get motion sickness, grab a snack. Or get a fast pass for something else (Big Thunder would be my next suggestion, since ever since they added fast pass to it, the line is slow.
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The line for the Matterhorn moves quickly, so I wouldn't worry about that, and since Space Mountain is down :brick: for a while, :brick: You're clear for the other thrill rides!
In DCA, I would say Soarin' but when ToT opens, head there!