I enjoy long walks. Especially when they're in the middle of the day. Today I took a 4 mile walk (2 miles each way) with my co-worker. It's not only nice to get out of the office once in awhile but to also remember that it's really important to build relationships with the people you work with. For heaven's sake you spend most of your waking hours with them, might as well get to know them.
In short, I feel really refreshed.