We went after 3pm on a Saturday in the school holidays. Very very crowded. They really should restrict the number of people or at least not let so many people in at once. We queued most of the way round and stood sometimes four people back from the glass and struggled to see. Very few toilets or "pit stops" - I had to breast feed my baby sitting on a ledge next to a tank of sharks with about 100 people watching :( but the kids loved it and its pretty good value if you go after 3pm. Good fun.