Been to Brisas, the camping spot on the beach near San Jose del Cabo, Baja California Sud, not far from what was, in 1999, the Presidente Hotel. We had wandered in off the beach a memorable day as we saw our first, small turtle heading for the water! We had lunch at that camping site. Friends we made some five years later had been at that spot for several years, likely at that time we were there, in fact. We had flown in to San Jose did some all inclusive, and then RV camped with my brother and his wife in their Motor home.
Never have been to La Brisas, the one which you say is north of Puerto Vallarta. You are right about the winter's water temperature in the waters around both states off Baja California. Too cold. On the Mainland side, we never stayed long in Mazatlan either, not warm enough there. It was only a short layover on the way to better things.