we are going on a long, much needed vacation to san antonio again this may. we're taking the kid back to sea world since he loved it so much last year. thing is, this is my 4th time going back to san antonio and it seems like i just keep seeing the same things everytime. is there any nifty little known activities you know of that will make this trip different? we've done the river walk, the market square, sea world, ripleys.... ive searched, and havent found any good family friendly things to do. help!