If the location is within the Galveston City Limits, I would contact the City Council, and request
a place on the agenda, to address the subject at a future Council Meeting. Then I would gather a few dignified appearing kayakers, and have a single spokesperson politely explain the issue at that meeting, and humbly request the Council to look into the matter. Do not appear to be a mob, as a show of numbers will only be seen as threatening and counterproductive. Have your ducks in a row, with your spokesperson having an outline of points to discuss, and keep your presentation as brief and to the point as possible. Demonstrate that you are seeking their guidance in resolving the issue, which will cause them to be more likely to sympathize with your cause. If for some reason they are unable to help, ask them to please point you in the right direction.
Above all, be certain to demonstrate courtesy and respect.
Choose a good spokesperson to address the issue. Do not claim to represent the views of anyone other than yourselves, nor make any demands or threats, and dress neatly and in a conservative fashion. You might want to take some photos of the area in question if that might help demonstrate the issue. You might also vow to create no disturbance or litter when using the area, and promise to clean up not only after yourselves, but to remove any litter left by others whenever you use the area. Try to show sympathy for the viewpoint of the homeowners in the area.
If the location is within the County, and not in the City of Galveston, do the same with the County Commissioners Court.
You might be pleasantly surprised at the outcome. You have nothing to lose.