It is going to be difficult to find a private bay guide that will take 6 on one boat. You might contact a guide and see if you can get a couple of boats that will fish together. There is good wade fishing from the road between Aransas Pass and Port Aransas if you want to go on your own.
Another option is dolphindocks. They have a 4 hour bay trip and will go out to the jetty and fish if the weather is good. You will be with other anglers, unless you want to charter the whole boat. It is definitely not wade fishing, but sometimes you can catch big fish on the trip. http://dolphindocks.com/
Good luck and let us know how you do.