Walk around the stores, Lego is pretty fun. Bit the void won't take them long, maybe 45minutes to an hour? I think the void is only like 15 minutes for the actual experience, but I could be wrong. So you won't have a ton of time.
I hate to say it, but there is nothing as cool as the Void at DS, unfortunately. If you want to stay in DS, as PP pointed out, perhaps take him bowling at Splitsville. Otherwise, I would look into one of the children's pirate cruises at YC or CBR which, when DS was younger, he absolutely loved. Or perhaps, Pixar Play Zone at the Contemporary one evening.
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