I think this may have originally come from @Bubbbles so if you see this, Sandi, please let me know, if you can. Thanks.

I did get a tentative ID of Hylocereus and I think that's it.

Tee, this looks very much like Hylocereus/Pitahaya! We saw them growing last Summer in Ecuador and if you like to compare your plant to my pictures posted in here?
http://garden.org/thread/view_...
We saw them growing over large boulders.

Thank you very much, Ursula. That looks like a match to me. Beautiful plant. I love the growth habit and the way it drapes over the rocks and boulders. I won't expect much fruit here since it will be in a pot with limited space, but you never know.

Thanks again!

It's a pleasure!