word up Oz! yo dude the water jump park is in a place called "lilydale" its about an hour from the city.
you would have to contact patto from teambuller cos hes the dude that runs it, but he is a fag who will probs try and charge you hard, any way go to www.teambullerriders.com and get his number from the contacts,
other than that there is a dry slope about 2 hrs out of melbourne, but its nothing dope its just two boxes and big air bag. its at mt baw baw. look that shit up. other than that there isnt really many options.