Karen said it best, depends on the dog and the park.

I have small dogs, and around here, most of the parks do not have a separate area for small dogs. And every one of the parks has had an issue in the past 3 years of a small dog being harmed or killed at a dog park. I just don't even consider it.

I have a fenced in back yard and invite folks over; and I have a friend who does the same. So that gives our dogs play time in a safe environment.

Many places offer doggie play times. Usually it is $5 for an hour, you may want to look in to options; even if you don't go, just to find out what is available in your area! These are usually places which offer obedience classes and / or doggie day care. The play times are either Saturdays or evenings during the week, and are indoors. Again it is a safe place.

Another option is to search on meetup.com for a doggie play group near you. These may or may not have a fee, depends on who runs it, where it meets and such.