We did that last year around the same time, only we stayed in Rockport. The boat tour I went on was
"The Skimmer". The boat operators were very nice, and seemed to be quite photographer friendly. The skipper did a good job of getting as close as possible to the wildlife, not just whoopers BTW, even had a group of dolphins playing in our wake for quite a while. The cranes were not real close to the water for the most part, but he did find a few that were close enough for my 300mm+TC. I was even able to use my tripod strapped to the railing on the top deck of the boat. While you're down that way, you might check out Goose Island SP,too.