Another quick park and grab cache awaits you in Winnebago Sports Park complex. Plenty of parking available, unless you come when there's sports games going on. This spot is rich with muggles, so do your best to be stealthy!
Here you will find some tennis courts, a frisbee golf course, a basketball court, a playground, 2 baseball fields, and several soccer/football fields. Lots of fun for the kids!
You are looking for a small container about the size of a 35mm film canister. Check the hints for spoilers of the exact location. There is also a spiral bound notebook located inside, which is NOT the log.