Nothing can stop Reese Witherspoon [1] when she's in vacation mode, not even a little dare from her teenagers. The mom of three [2] — Ava, 19, Deacon, 15, and Tennessee, 6 — spent the Fourth of July weekend with her family on the water, and took Deacon's challenge to not only jump off a boat, but slide down a three-story inflatable slide.

"How did I let you talk me into this @deaconphillippe?!" she captioned one video. Reese eventually completed the dares (wedgies and all!), with the help of a friend cheering her on. Take that, teenagers! You can't foil this cool mom.

Keep reading to see more snaps from Reese's fun July 4 at sea.