Unemployed, 3 1/2 months on my hands, but very limited cash. Any creative ideas to prevent insanity?

I don’t have a job. I’m going back to college in September, which I’m very much looking forward to.
I’ve been doing some voluntary work, but I don’t have the cash flow to travel around much, so I’m limited to my hometown. I still have a huge amount of time on my hands.
I’m becoming very unhappy and finding it increasingly hard to motivate myself.
I can’t go out much, as the money I do get pays off outstanding loans – repayments I was in a position to keep on top of when I was employed.
I don’t want to throw myself too many pity parties. I know it won’t get me anywhere.
So I thought it’d be an idea to ask you creative flutherites for ideas on things I can do to occupy my time.
Fun things to put a bit of pep in my step if you will.
At the moment, I get up at 8 most mornings. I exercise daily. I get out and about visiting friends. I’m also working my way through a reading list for college.
Any suggestions will be appreciated :)