Personally I would love to see the
Atlanta Georgia Botanical Gardens. I have heard from numerous folks that this place is just too cool to miss, that one and the
Huntington Botanical Gardens here in California, the wife has been to this one several times for Orchid shows and says that it's a very beautiful place to see.
As far as nurseries go (other than the one where my wife works) I would have to say the most awesome nursery that I have ever had the fortune to visit (I was a buyer from them for yet another nursery) is in Salinas California and probably known to most of you, or at least to those that read the book
"Orchid Fever" by Eric Hansen, and that would be the Terry Roots
Orchid Zone.
There are a few private collections that I have also had the fortune to have been invited to see that just blew me away.
And I am not even going to go into which countries I would have loved to crawl around in searching for new stuff ... or old stuff, I couldn't care less, just so I get to crawl through the jungle lol (not something I am physically able to do anymore) and get bit by all kinds of neato critters and ... and ... well, you know, stuff.