what would you do? HO suggesting unleashed dog park

I'm sitting a female golden retriever. on walks, and even in the house, she barks aggressively at other dogs and has even lunged at them.

the HO said they love taking her to a few areas and letting her off leash and if she acts up, to give her a treat to make her come back/listen to me. other reviewers said they have taken her to the dog park and didn't mention any issues.

I would be more willing to have a bad review than have to deal with the dog attacking another dog or something, but idk if I'm just being paranoid.

also, feel like my rental car company would definitely charge for the pet hair cleaning since I would have to drive her to said park.

thoughts? advice?