If you have a spot that you'd like to add to the map, anywhere in Texas or anywhere else, find the location in Google Maps, then click on the "Link" button at the top right of the map. In the popup that appears, click where it says "Paste link in email or IM" and copy the link. Paste it into a PM to me and I'll get them on the map.
Map of Places to kayak fish in Texas
If you want a spot posted, I need the location information per the instructions above. If I have to go searching for the location, or if the information is too general (i.e. Brazos River) it's not going to get posted.