Hi again. I think blizzard beach might be better. The wave pool at typhoon lagoon produces very strong waves and would probably tire your son very quickly. Blizzard beach I find has shorter walking distance and is really beautifully themed. Go firstly thing in the am when it opens and you will be able to avoid the lines as they get quite long in the afternoons. The chair lift is helpful for the longer slides as you can ride instead of walk up stairs. The family tube ride is a blast just let them know you need extra time loading and unloading. The pool there has bobbing waves and it is easier to stand in. I hope you have a wonderful time with your family