Yes, like everyone here said, you just have to adapt. The only place I currently have to practice is in the woods around my house, and if you go out there enough you can eventually find something to work with. It also depends on the type of woods...some things may be better (and safer) than others. Be sure to monitor your surroundings depending on where you are, not only for the places to train, but also for areas snakes and such like to hide (and live).
But like I said, I think it is relative to where you are and what you think you can do. If you browse around for places and objects in the woods, and work your way up from there, I think you will do alright. But also like everybody else said: you really have to be careful what you train on, where you train, and how you train. Some things may look attached...but really aren't so much, and some things may just be too soggy or slippery. I hit my back on a small log when something I grabbed broke (when I was younger)...I am just grateful all is ok.
So just go out and train! I know I don't have much experience, and probably shouldn't be giving you advice as much as the more experienced people here...but I just wanted to give you my 2 cents, just in case (since the places I practice are the woods and the gravel drive way).