I was in a similar situation years ago. I don't know your particulars, but for me the best thing was to rest and free my mind for several weeks. I wanted to pursue some of my interests during that period, but I realized the best thing was to unburden myself of thought instead of substituting one form of thinking for another. In the end, I went back to school with a clear head--tabula rasa--and found myself refreshed and motivated for learning. During that time, I did a lot of hiking, listening to nature, and did some fishing. Even tried meditation. I quit my FT job when I returned to school and found PT work instead. Since I had savings I could afford to supplement my reduced earnings. I don't know what type of writing you're interested, but I would stay away from academia during the summer. By the time you finished a summer program you won't have time to practice what you've learned. You'll be immersed in tons of reading and writing in your FT program come fall. If you really want to write this summer, just rent a cabin in the woods and write. Your situation and mindset may not be the same, so take my advice with a grain of salt.