Eh, mostly indifferent on the stamp rally. The rewards are kind of cool, I guess. The running around to gather stamps felt a little pointless though. I was hoping for something more along the lines of a scavenger hunt, would have been more involved that way. What has me curious right now is that Blather's wording, "You've gathered all of today's stamps," or something like that, implies we can do this daily. I have no idea what they could do as rewards on further days. My brother and I did notice that we had different stamps to collect though, so I guess the stations will be random every day.
Oh, and why was there no stamps or plaque for the art section? Kind of a strange omission.