My husband and I ran the 5 miler, and my 3YO ran in the Wibble Wobble (basically across a soccer field, short side). Both were a lot of fun. The 5 mile course is surprisingly challenging, sticking mostly to the trails in Golden Gate Park. Not stroller friendly, but I love that the race showcases these trails. The Wibble Wobble was a little disorganized, but in the end, it worked out. And it is possible to participate in both!