L.I.
Hi!
I know of a couple depending on what side of Plano you are on. There is a great park at Preston Meadow and Parker - from Parker you turn North on Preston Meadow until you hit the park.
Then if you are East, like we are, there is a great park downtown - Haggard Park - it is right off 75Central and 15th st. From 75 exit 15th st and go east on 15th - you'll see the park along with a gazebo on the left - there is also a great little shopping area down there with brick road main street and a little farmers market!
Hope that helps!
Have fun!