I camped until I was about 7 months along. Balance is one of the key things to watch out for. And accessibility to rest rooms! :) I was still hiking and canoeing at that stage but my weight gain was minimal due to having gestational diabetes early on. Take it slow, don't do anything strenuous or that requires a lot of stamina. We call it "puttering" which we often do now. Stroll around some shops, poke around a flea market, let your 2 year old run amok in the playground while your wife sits and watches you chase her, play games at the camper, sit under a tree and read to your little one (and the unborn baby), and just relax. Make sure you can take frequent breaks if your wife needs them. As long as you aren't putting her health or that of the baby's in danger and you have the doc's approval, just go enjoy yourself but be aware of the limits you might encounter. Worst case is you have to go home early. BTW, I was still tent-camping at that point, and our last trip was to the Canadian Maritimes just before the campgrounds closed for the year. It can be done.