What is to keep you from taking a tent to a camp ground?
How long would you want to do your retreat? What kind of a retreat would it be?
Taking a tent to a campground would be fine, but my girlfriend would say, "Why aren't you taking me?"
I'd like to do at least a 5 day.
Why a solo retreat rather than a group retreat? There are group retreats throughout the year.
There used to be a solo retreat place in NY. I don't know much more than that now. The person who mentioned it to me said that the organizers had basically set up a place where Buddhist practitioners could do solo retreat.
There is also the Palyul Retreat place near Green, NY as well as many other places (Tsechen Kunchab Ling, a Sakya center) - numerous places now. Many advertise the possibility of solo retreat but I don't know how accurate that is.
There is a Gelug place near Raleigh I think. You could call them up.
Your girlfriend won't ask about going to a retreat place instead of a camp ground?