I was on Enchantment in August. There was no basketball court up on deck. They had some shuffle board areas and stations for doing a circuit training walk - but no basketball.
Tell your son to try the bungee tramboline. I think his disappointment from the lack of a net will be taken care of. My 8 year-old had a blast on it.
There is also a rock climbing wall.
Enchantment - August 2005