I say yes. I think as long as you keep control of your dog and let them know when they're out of line, there should be no aggression problems resulting from trips to the dog park.

I love taking Kiara to the dog park/offleash beach because it gives us a great opportunity to work on commands and her socialization. She's become a lot more brave and social because of the park & beach. She also has a great time and absolutely loves it.
The distractions of the park are great to work with your pup, that way they'll be used to performing with distractions.