Probably not the answer 'cause I always over think these but maybe if I chuck in more water it'll splash outside the barrel, leaving less water in there than before making it lighter?
I think if you put it on that many rides it might be worth taking the Alton Towers route with a 'record-your-day' DVD thing? Although I'm not sure it'd be a good idea to have the feature on so many rides, the novelty would wear off unlike a photo.
It's a good map, I wish they had changed some of the rides' pictures to be a little more like the actual things (looking at Nemesis' mainly here) but overall as a style and general over-view it's the best its been for a while.Gets a thumbs up from me.