In terms of school itself (rather than simply education), I can't really remember my last day too well. I remember getting out of my GCSE Statistics exam and being glad for it to be over and done with. We went and played frisbee in the park afterwards. Hardcore. As myself and two other friends finished our exams before most of our other friends did (as we didn't do Sociology), we went to Manchester on what was everyone else's last day. I can't remember my last day of education specifically, though I do remember the last week/term.
As for school meaning education, well, I'm still in education. As for what I'll do over the summer, I intend to get a job and work. Though given how terrible Wales is for jobs, I'm unsure how well that will work out.