Parking in Manly is terrible and the parking areas near the Waterworks are only 2 hours. The Rangers do patrol the area, so you may be better off parking a distance away and walking or taking public transport. We celebrated my daughter's birthday and invited nearly 20 children. There are 3 waterslides for the kids and they only came out from sliding when they were hungry or cold or at kick out time. As we booked for a group over 10 we were provided with a little table and set up ready for the children coming out for food and drinks. The staff are really pro active if the kids muck up and they get a time out if caught stopping in the tunnels or basically being silly, but this doesn't happen too often. The kids had a ball and all said they were sore the next day at school, having run up the ramp that leads to the top of the slides many times during the afternoon. Definitely one of the easier parties I have run.