Port Aransas fishing info. needed(1st time w/ boat)

Heading down in a couple of weeks w/ the in-laws and their boat. Looking for info. on where to go that is easy to get to from a boat ramp. We don't have a GPS or anything.

I was thinking about putting in at Marker 37 or Clems and running the channels to Pita Island area or going the other way towards Shamrock..? Or fishing just the sides of the channels? etc..



Also, any good online reference maps w/ the depths of these areas would be helpful as well.



Thanks..