Tiger Woods & Lindsey Vonn No School? LET'S GO JET SKIING!

Lindsey Vonn has gone from the boring (taking Tiger Woods' kids to school) to the SUPER FUN ... jet skiing with Tiger and his little ones in Palm Beach yesterday.

The new couple decided to take advantage of the long weekend by hitting the water with the kids near Tiger's Florida home.

Seriously this time ... that sound you just heard was Elin Nordegren's head exploding.