wonderful question, steph, and i'm loving all the answers.
there are a few places we'd like to travel to - new zealand, australia, and italy being chief among them. (some u.s. spots, too.) and since money's no object

, i'd go to a place and stay there/live there for 3-6 months to really explore it and get to know the culture. not the "if it's tuesday this must be belgium" kind of trip.
we'd build a home in ireland where my mom grew up. she's the oldest of 9, and she and her sibs have the farm still. it'd be a place that my whole family could take turns using to keep closer to the irish cousins.
we'd start a scholarship program at my kids' school to help out families who need the financial assistance.
i'd learn to play the piano. dh would spend more time coaching t-ball, baseball and the like. we'd tour all the MLB parks in the u.s., it's long been a goal of his.
we all disney world freaks, and we'd probably pay to have a day of that insanely expensive, guided, behind-the-scenes tour. or two days.
oh. this one is pure selfishness. i'd get candice olsen (hgtv's devine design decorator) to help me design my studio. and maybe the rest of the house, too.