The Google map isn't very helpful for this park. It looks as though Gaynor Dr hooks up to McHugh, but it doesn't. What you want to do is take Briggs along side the high school and make a left on Sween Drive. That takes you over to Gaynor. Take a left and follow that down to St Croix.
Unfortunately, the park itself isn't worth all the effort of finding it. The playground is old style equipment and there's not much there. The swing set has two regular swings, a swinging bar, and swinging rings. There are no baby swings. Attached to the swing set is a teeter totter and on the other side is a metal slide. The playground is way back from the road with the grass baseball field between it and the road.
Because of the old style equipment, this park isn't recommended for babies and toddlers. Older kids would do ok with it.