We usually visit HRC when we can. Would have to look at the pin bucket to see which I've been to, and which I've just got stuff from.

Short list of favorites:
Best View, Kona
Best Food, St. Thomas
Favorite Single Display Item, Wash DC (signed handwritten music from Sgt. Pepper's LHCB)
Display that set me on my heels: Baltimore, concert flyer from Fort Worth for Jimi Hendrix last US tour: I was at the concert (May 9, 1970).

First HRC for me was Wash DC, most recent Puerto Vallarta