We have seen christmas lights, the LED bulbs......
Strung from tree to tree like a washing line
Attatched on small shepards hooks placed around site
Attatched to the awning with clips designed for the job
We have seen numerous amounts of awning lights, google them and you will find a huge variety. You can buy the clips for stringing onto the awning.
If you were to put lights out, you could check with an RV shop on what they suggest would cause the least damage...... preferably none
We like the idea of stringing them and being supported by small shepherds hooks or some sort stake. We have a lot of the shepherds hooks that came with solar lights for the garden. We kept them in case we needed them after the lights were worn out.
Good luck!