Dirtbiking and jetskiing...and praying for it to be an early winter, preferably La Nina.
I used to race harescrambles on the dirt bikes (I have a CRF230 and a CRF250X) but I gave it up. Too old and too easily breakable; I took some bad crashes that took some time to recover from and I have a 3 story house and 4 kids. Still ride in the woods a lot, pretty accessible right from my backyard.
Jetskiing takes up the rest of the summer; we get big groups from hubby's work and it spreads around the gas cash.
For the most part, I just long for winter...I prefer it to summer anyway. I'm a California transplant and I HATE the summer!