As if flipping, dipping, spinning, and rotating your way through 20 acres of thrill rides wasn’t enough, this year’s I-X Indoor Amusement Park has added yet another enticement: an eye-popping live performance by Cirque Shanghai, a troupe of world-class Chinese acrobats. High-wire acts, choreographed balancing routines, and death-defying motorcycle stunts are all part of the new show. And that’s in addition to all the usual attractions. Big Cat Encounter offers up-close interactions with fluffy-but-ferocious felines. Kidzville brings more than 25 rides and a petting zoo to the smallfry. All-day, all-inclusive admission ranges from $10 to $24; kids under three are free. Snag your tix by phone, online, at the door, or at Marc’s. The I-X Indoor Amusement Park is open through April 15. Check out the website for days, hours, and an entertainment schedule.