The hanging carts gently gliding on the nifty-looking track over Camp Jurassic constitute a very short (about 75 seconds) clacking route through the trees. Cool as it looks, it was poorly designed, fitting only two at a time, and huge lines were inevitable. Facing irate crowds, Universal instituted a rule: No adult could ride without a child. That both prepared guests for the ride’s tame deportment and cut down on the wait. Attendants may be willing to load child-free adults when the park is dead. Strategy: Skip this underwhelmer if the wait’s more than 15 minutes.