For the most part we leave everything out. We will typically slide the chairs under the coach before retiring for the night--this is more to avoid dew on the chairs than to prevent theft. Anything that can be damaged by moisture will be put away (that darn dew again, or it does rain sometimes LOL).
If we bring along bikes we'll usually lock them to a tree or the coach.
Everything else usually stays out (BBQ, tables, sometimes coffee makers, etc.).