Do any of those things, whatever interests you. Nobody here can tell you what is going to hold your interest. I'm convinced the only way to really "cure" burn-

Do any of those things, whatever interests you. Nobody here can tell you what is going to hold your interest. I'm convinced the only way to really "cure" burn-out is to change scenery and time. It sounds like you've got both, so go do something, or do nothing at all. It doesn't matter too much. I know you have lots of things you're thinking about doing now, but start your sabbatical anyway. It only takes a couple of weeks of doing nothing until you're ready to plan -- anything -- to get out of the boredom. Take the time, do nothing, and then decide.