Guess I'm too late to say the ice at the Sea Shell on Rio Grande Avenue is very good, too. They have something like 60 flavors, and the cheesecake varieties are exceptional. They even mix in graham cracker crust--yum!
Also, all of the boat tours are very enjoyable: the Paddlewheel Queen, the Silver Bullet, and the whale watching one (I forget what it's called). Pick up some brochures for their schedules. I try to go on one every year, and I always love them.