You might want to check out different times? We have one dog park that we go to when the weather isn't great for walking in town and we have had nothing but good experiences. We stay out of the the small dog area because I do find that small dogs tend to be very pushy with my two but in the regular area they have had no problems. Dogs run over to sniff but the big ones seem to know that mine are too small to play with even if they have just been wrestling with another large dog.
I have been to dog parks though (one where my son lives) where the owners seem to have little interest in controlling their dogs and I do find that very annoying. Maybe it's from being in class with big dogs since they have been puppies but Rylie in particular seems to prefer the company of larger dogs. He has had a couple of different small fluffy dogs snap at him so he tends to keep his distance but he has no problem racing an 80 lb Boxer pup for a stick and coming away with it. The boxer (who belongs to my friend) looks at his Mom as if to say He took my stick
Mindy Tri - Feb/97
Max - Ruby - Sep/08
Rylie - B&T - June/09