I have the same problem. And I feel so tired and worn out of the week, but then I realize that I don't have the money to spend for a weekend get away.
The first thing I was going to say was the beach. But it will rain in your area. Usually, when I'm bored & broke (which is happening often to me, lol)...
1. I take the dog out to local lakes or hiking areas and walk her for hours.
2. Clean out my house and have a yard sale. I can stay home all day and clean the house. I end up finding a lot of stuff that I don't want anymore.
3. Go camping for the weekend. If you dont have a tent or other camping items, more than likely a friend, family member or a friend of a friend will be willing to lend you the items.
4. If you have any tourist spots in your area (and your talented in some way), you can "brake dance". lol. Here in the bay area, we call it "brake dancin for lunch money". You'll make money and have fun.
I always see people selling artwork that's made then and there (usually with spray paint), sing (In Santa Cruz, I've seen a black girl who looks just like Tracy Chapman who sings her songs along the boardwalk. That's cool), etc. Recently, I've seen girls rapping. They have a little ipod boombox, and they sound like MIA.
I've done stuff like this when I was younger. My moto is... "do it until the cops come". lmao
Also, I should mention, in San Francisco we have a gentleman called the "Bush Man".
The Bush Man - Fisherman's Wharf - San Francisco, CA
He has been doing this for over 10 years. He would sit along the Pier (where all the tourists are at) and hide behind branches and leaves he is holding. Then he would scare people. It's really funny.