Here's Kelney's 2 cents for what it is worth...
It is pretty rocky back there. Where footwear that provides protection for the feet but is also water friendly. Beware of the black algae on the rocks. It's a little like black ice. Also bring 2X the amount of lures you think you need.
Las Conchas is not hard to get into. Just state that your staying in section (1-8) and lot (X) and they will give you a placard and you are good to go. As long as your gringo and you act like you belong there then they do not question you to much
Or just state your visiting Roberto! Honestly I think the fishing is better in the Cholla area or behind competition hill. Take Calle N (if I remember correctly) until it dead ends to get back into the circled area on the map. See my report from March on how to get back behind the hill. PM me if you need further clarification. A 2 wheel drive can make it back there fairly easy. Getting to the estuary East of Tessora needs a 4 wheel drive that is good in the sand or deflate your tires. Otherwise, bring a shovel, lunch and probably a 12 pack. My 4X4 is somewhat of a pig in the sand but deflate my fat tires and I can get out of there without too much problem. Getting in is easy, getting out is not.
May the wind God bless you with calm waters. Have fun!