Hi, Valerie! There are many locations outside the parks that take the Disney Dining Plan. You can visit food courts of any of the resorts, Downtown Disney, and Water Parks. Click
HERE for a list of Disney Dining Plan participating restaurants. If you see a yellow box with a "Q" next to the restaurant, you can use your quick service credits at that location.
And just a quick note in case you didn't realize this: you can add days to your
tickets if you want more days in the theme parks. Once you are past 6 days on your tickets, to add additional days, it only costs about $3 per day per ticket. If you are interested in adding on additional days, just take your tickets to a guest service window at any theme park and they can explain the ticket upgrades.
Have a great time in WDW!