One idea would be to go on a road trip within your state to see cities you haven't been to before. You will find that a lot of places around you are great to explore if you're on a budget and can't go too far. The other great thing about this kind of a trip is that you can take along friends and family to have a good time with them. Figure out the gas prices in your area and where you're traveling to see if it's going to cost you too much if you're on a budget.
A couple more tips would be to go on a last minute cruise, or to go camping. The great thing about a last minute cruise is that the line is going to have a lot of deals so that they can make as much as possible and fill up the last seats. As the site in the reference indicates, you can go on a cruise that day for as little as $30. Camping, of course, is great if you want to get out into nature with family or on your own and doesn't cost all that much because lodging is generally free.
1 - http://www.gasbuddy.com/GasPriceMap
2 - http://www.nomadicmatt.com/travel-blogs/8-great-alternative-budget-vacation-ideas/