This park has it all, butterflies, and large field to fly a kite in, and an awesome playground.
During nice weather this park is full of people enjoying the playground and park, so be on the look out for muggles.
As for the cache, this one was put together by Geo-Nat. She picked the spot and hid the cache, so keep in mind that being 3 ft tall to get to the location might be a good asset. Taller cachers might find some thickets blocking their path. 
Please park in the lot for Great Oak and Butterfly Park. Do not access from Ryder's Lane.