Break in routine will lead to a freaky gain?

This past summer, I've been working in my mom's apartment's gym. Treadmill, weights, all that good stuff. Worked just fine. However, this Wednesday, I'll be going back home and, though I plan on walking my old route which is about 80 minutes, I'm worried that, since I've been working with weights and such, that walking won't cut it anymore.

I won't get back to a gym for about 12 days, until school starts again. My question is, since I'll be taking a "break" from the gym, will this cause me to gain?

12 days really shouldn't make a difference, especially if you are going to be walking so much.  I've pretty much stopped weights this summer, and haven't gained weight.  Haven't lost much either...

Oh, that's not so bad. :)

You'll prob hit your equilibrium weight. If you keep eating well, you can prob drop another pound or two.