I go to the dog park maybe 4 days out of the week now and both Mav and myself love it. I've been to maybe 4 different dog parks and my local one is the best because of the other owners, who are completely responsible and are always keeping an eye on their dogs. However, I'm sure you'll encounter a few times where an owner just lets their dog loose and just goes about the rest of the time looking at their phone or doing something else, not watching their dog.
Just make sure your dog is being polite. Not harassing other dogs by constantly trying to hump (yes I've seen Mav even get humped by female dogs a few times) or her getting in their face if the other dog doesn't like it.
#1 advice: if you got a bad feeling about another dog, act upon it by leaving.
At my local park we have what we call the "weekend warriors", and that's when there can be some trouble dogs; aggressiveness, dominance issues, etc. Try to get to know the regulars and they'll let you know which dogs have had issues at the park and which ones to avoid. The advice from my fellow owners has helped me avoid bad situations a handful of times.
Alot of users here are against dog parks, with good reason, but in my personal opinion, the benefits far outweigh the negatives as long as you're aware of the other dogs there. Mav got bit at the dog park we go to months ago and wasn't phased by it, he wanted to play with his friends 10min after the incident happened. I run into the owner of the other dog (who is a known aggressive dog) a few times and just move over to the small dog side when I see her, or if I stay on the big dog side she doesn't come in. Why she keeps bringing him is beyond me, but it's a terrible lack of respect for the rules and the other owners there who have spoken to her about it.