If you ask me, if you're feeling burn out, doing nothing for a while might be your best course of action.
I've personally never felt burnt out from doing art. This is largely because when art block hits, I just follow the cues of my body and take the time to refresh my mind. What I might suggest, if you wanted to keep the brain active, do some reading. Read other comics, either on this site or printed work. Take the time to observe how other people do comics. Treat it as market research. If you see something you really like, try to emulate it in your own style.Or just put a pencil to a piece of paper and just see what comes from it. Don't go in with a plan, just draw lines and follow your intuition. It'll probably look dumb in the end, but every bit of work is vital, even the failures.