How big r tents spots my tent is 20 by 10

A 10 by 20 will fit. However we no longer feel safe at Pio Pico in our motorhome. I definitely wouldn't stay there in a tent.

Sites are quite large, that tent should fit.

There is more than enough room for it on almost any site you choose.

I have a 10 person tent and it fits no problem

No problem, Steve

Your tent should fit in most spots i fit a 10 person tent in there

Check also for when they allow the tents and for how long at one stretch of time

I think that may be to big. Call the park they will be able to advise.

Agree