This is a very popular park in the city of Battle Ground, with many different kids activities planned throughout the summer. The water feature is a very popular attraction and you will sometimes see pickup football or soccer games during sunny days.
I got this cache idea partly from another one in Vancouver. Please be gentle when finding it and let me know if there are any issues to be addressed. As this is such a popular park (as seen by the frequency another cache here has been muggled), stealth is very important. You shouldn't be watched from the nearby trailer park, but it wouldn't hurt to be careful from that area also.
This cache qualified for the 2013 Battle Ground Geocoin Challenge but all geocoins have been handed out! Look for the 2014 and future challenges for more fun. You can still use the codeword for the 2013 Bonus Cache though.