The secret is: ride your bike! Eat whatever you want! Rent a kayak and paddle!
I'm serious! That's all I did.
After a couple weeks of guilt-free eating whatever I wanted (no matter what it was) I was heartily tired of chocolate and goodies, and was craving all those healthy foods.
I still eat what I want and when i want, and often it's good stuff as well as the fun stuff. somehow it just works. If I don't feel guilty or try to squash cravings, it all works out just fine.
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson