6) Drink Coasters
I picked up this habit from an old roommate I lived with in Montreal. Besides being very useful items, beer coasters are great keepsakes: they’re a little like business cards, but usually with more interesting designs. I tend to grab a couple whenever I find a new beer I like, or try something unusual. Then I just toss them on my coffee table when I get home and am reminded of my trip every time I use one for a drink. I’ve also framed a few particularly neat ones in glass frames you can get from Wal-Mart.