Mr_Bill is talking about stealth camping, so forget about campground rules. Also, he's talking about using a hammock in the winter in southern Europe, not the Yucatan during the summer (where the hammocks are both traditional and a smart way of sleeping comfortably in that climate). I personally have seen snowflakes fall along the Mediterranean in the winter. The idea of trying to sleep every night in a hammock at temperatures dropping to near freezing sounds completely crazy to me. And nobody has addressed the lack of trees in some area. I'll add another thing: steath camping near the Mediterranean will not always be easy, whether it's a hammock or a tent. The coast is overbuilt and population density is very high.