When we were travelling in Japan a while back, Kelly and I each had a Moleskin notebook we carried around to a) read language notes we’d written, b) draw any diagrams we needed to help explain stuff to the natives, and c) collect stamps. We didn’t know about C until we got to Japan, but golly, I’m sure glad we had somewhere to put them all!
We became obsessed with picking up a stamp wherever we could find one: airports, train stations, galleries, tourist offices, and tourist destinations. They were everywhere. Check out the stamps I collected. They make me happy and nostalgic. Japan is awesome.