Do 9-year-old boys take baths? My 8-year-old son hates to, and is in and out of the shower in 1 minute flat! Would you be interested in taking him with you?(LOL) He has his own annual pass! Honestly, I think your son would be embarrassed to go into a ladies shower. If I were you, I would make a big deal out of packing his own shower kit(shampoo, soap, toothpaste, etc.)and wait outside the men's shower for him. The 2-way radio idea sounds great(we have Cobras that are waterproof)or a watch. You may even meet up with a family with a son the same age as yours, and maybe they could shower at the same time. And you could always do what I do when I am standing outside the men's room waiting on ds...ask someone who is coming out if they would kindly check on your son. Most people understand.