This gets asked a lot, and the answer I give is always La Vibora (the Bobsleds, to the left of the entrance).
the two lowest capacity coasters in the park are La Vibora, and Pandemonium. And the lines get super long, super fast, tho they sometimes run single rider on La Vibora.
Honestly, La Vibora isn't super exciting, but it IS a unique ride at the park, so I would go into the left, hit La Vibora, then the flume, then New Texas Giant, Titan, Shockwave, Runaway Mountain, Runaway Mine Train, Mr. Freeze, Batman, Judge Roy, THEN Pandemonium if still have time.
that covers all the coasters (other than Mini-mine train), and there are several fun flats to hit after (including the 400ft Skyscreamer, and the Superman Towers of Power. . if you're braver than I).
Shockwave and New Texas Giant are both gonna get re-rides from you, pretty much guaranteed.