From bus stop to bus stop is .25 miles (roughly in the center of each section). You're walking along the main street mostly including crossing a traffic circle and small bridge over one of the canals. You walk past the Preview Center parking lot and then get to the main areas including the Community Hall and pool.
It can be good and bad, depending on your walking tolerance. If you're carting a lot of pool toys or groceries or if the weather isn't cooperating, it can be a drag. Interestingly though, if you stayed in BCV and walked to the sandy beach kiddie section of SAB you'd be walking the same distance. The only difference is that most of it is indoors at BCV.