Well... here's my perspective.

At PAG yesterday there was a group of 4-5 riders who insisted on riding in the middle of the swim area. This was a crowded beach of 500 people and about 30 small kids in the 2 - 8 age range playing and swimming in the water.

(edited because I believe this issue is being taken care of)

All you have to do is ride outside the bouys, or walk 500 feet north of the swimmers and sunbathers (where everyone else was riding).