All of my teachers look forward to summer vacation much more than I do. That statement alone reveals a lot about what it's like to be a teacher (at least at the high-school level).
This is what you need to do: go two miles into the woods, build a cabin, work six weeks out of the year (picking berries and whatnot) and devote the rest of your time to thinking (and writing, of course). It worked for Thoreau, but only for about two years.