I won't have my guitar or anything in the way of a guitar while I'm gone. Two weeks of no playing. Any exercises I can do without one? And when I get back, what's the best way to get back up to speed?
Taking a break might actually help you once you get back. Just relax on your trip. Or, you could go buy one of those finger exercising things with the springs. I'll see if I can find a link.
If you're going to Hawaii... Pick up a ukulele
contrary to popular belief, not playing for a week will not affect you tremendously, just practice a little more than you normally would for a week when you get back.
as dk2 said I think not playing for a week or two won't do any harm really. It may even help. Just brush up on some theory maybe and relax ad have fun!