There are oodles of places to sail in the delta and the low draft
and good pointing of a cat would be ideal. You would want to install a motor
mount for a small kicker
so you could explore the numerous leads and bays. There is a delta sailing club and regular races include an annual race
from sacramento to stockton (or visa-versa, I don't remember which.) There are slips on the water
but they are typically smaller places and you will have to poke around to find some of them. A slip for a cat might be harder though.
I used to camp out in the delta when I lived down there and it was quite a shock each time I came upon the wide expanse of water at the confluence of the Sacramento and San Juaquin rivers. Much of the delta is wider than most people think and it is possible to beat in 'wrong' direction and make your destination
especially if the current
is with you. What you want to avoid is the situation where both the wind
and the current
is against you as that tends to make a one-way trip.
I would rent a truck and have that cat in my side yard in and instant. Good luck.