With three adults it would be too crowded IMO, plus you pay extra for the third adult...can't remember the amount but it's around 15.00 a night for an addl. adult. Pop Century has HA rooms with two doubles but there is extra space taken up by needing a larger bathroom, so really you'd be better off booking two rooms since a HA room that accomodates four, while feasible, might be a bit "tight".