My guilty "pleasure" (tho it's certainly not that): a 60-mile round-trip commute to work. I do work at home once a week when I am able to, but I still feel bad driving that much. And we drive to our sailboat, 3.25 hours each way, for vacations. Bad, but not as bad as the pre-boat vacations we used to take, which usually involved driving to Florida, New England, and such.

DH and I try to make up for our carbon footprint by recycling ferociously, using compact fluorescents all over the house (the newer ones really do have a warmer light, I was surprised), re-using as much as possible, not purchasing junk we don't need, composting, growing some of our own veggies, buying locally whenever possible, and all that good stuff. But I sure wish I could bike to work. Hopefully someday -- our life-long goal is to be car-free eventually.