Rather than go onto a waiting list, we decided to drive out to the other end of San Carlos, to the cadillac of Mexican RV parks, El Mirador. This is a new park, with 30 amp outlets, good water pressure, sewers, and several channels of US cable TV. The sites are HUGE, with great views and concrete patios.
This is our site at El Mirador. Look at all that space! Unlike busy, crowded, friendly Totonaka, El Mirador is quiet, roomy, beautiful and friendly. Another plus, which wasn't obvious until night time: the lighting is very subdued - none of the bright streetlamps on poles that are so common in RV parks everywhere.
Besides the spacious individual sites and modern utilities, the amenities at El Mirador are a cut above standard, too. Here is the swimming pool and hot tub - resort quality - though it is too cool here now to use them! We came planning to stay one night, but it is so pleasant, and the weather in the US sounds so cold and miserable, we will try to extend our stay for one more day.