My 14 yo daughter and I will be flying in on a Wed evening to meet my hubby who will already be there on business so we will have a rental car and we are staying at the Embassy Suites on the Riverwalk. After we throw our bags in the room Im thinking we should hit the River Tour Cruise (should I buy tickets online or just get them there?) to get our baring's and then dinner it sounds like on the Riverwalk Boudro's is pretty highly rated. Thursday we will spend the day at Six Flags hopefully it wont be as crowded as the weekend.... Im not sure how to plan Friday and Saturday, we would like to do the Alamo and the Missions as well as explore the Riverwalk, King William Historic District and the El Mercado/Market Square. We fly out noon Sunday so not much time that morning. Any suggestions on how to best use Friday and Saturday?