Outdoor rugs are great to throw down on top of gravel, sand, grass, or dirt to create an even surface and keep you from tracking so much mud or sand into your RV.
You can hang lights directly on your RV with these weatherproof adhesive hooks, or you can hang them from tall shepherd's hooks, which make a nice place to hang plants as well.
Garden flags and welcome signs are a fun and easy way to decorate your campsite. You can find a large variety of them at any store with a lawn department.