Have sailed from Galveston quite a few times. In my opinion, the easiest and least stressful transportation from the pier to either Hobby or IAH is the cruise line transportation. Getting from the airports to Galveston is another story. Because we always get the the port at least a day early, the transportation offered by the cruise lines isn't really an option but there are a number of reliable shared ride shuttles. Just Google it and pick the one that suits your fancy.