My post is probably more suited to but I never got around to putting my ideas out then, so here's 10 ideas: As Slick said, first step is to get a new management team (or even a new owner) that realises significant investment can result in good returns.
Go through the park and perform general maintenance on everything, e.g. painting (not Wiggles World colours everywhere please), cleaning etc.
Remove the Motocoaster ... from the thrill rides list -- market it as a family ride, and there would probably be less disappointment from riders due to the shifted target market. While they're at it: ditch the Mick Doohan license, remove the overflow queue, reconfigure the standard queue area and merchandise shop to open the area up, relocate the V8 simulators, and retheme the area as the Rivertown Raceway or something. Given point 6 below some small land reclaimation or a boardwalk over the water may be the way to go here.
Develop an apocalyptic themed area on the former site of Blue Lagoon. The path down to the area would be fairly similar with a new toilet block (marked A on the graphic below), merchandise shop (E) and food outlet (H). It would be headlined by a Rocky Mountain Construction/Alan Schilke wooden coaster (station at F and entrance at G). The ride would begin with a turnaround leading into a lift hill to the far side of Oakey Creek. A pre-drop, turn, and first drop follow. The track inclines over the railway line and enters into an inverse banked turn near the runout for the old toboggan ride for a great teaser/photo opportunity for those going down the path. Other elements present in RMC coasters would follow (e.g. double ups, double downs, overbanks, high speed floats) with a double barrel roll parallel to the railway line concluding the ride. The other attraction would be the rethemed AVPX laser tag with some sort of zombie theme. It would consist of an indoor queue ( , briefing rooms © and relocated tent (D) for the main skirmish.
Demolish Eureka and the Gold Rush chairlift station, and build "Eureka Mountain 2: The Forbidden Shaft". Gazza created a great proposal a few years back so full credit to him.
As part of this year's AWE upgrade: remove the old chairlift station, remove the ramp to nowhere, and relocate the amenities to a north-west extension of the merchandise shop/train station. Repurpose the former Oakey Creek arena and surrounding area into a covered, but open-air, presentation venue suitable for a variety of wildlife presentations, e.g. bird shows.
If Captain Sturt can't be fixed and it is just going to gather leaves and rot, remove it. Use the current dock area as a loading station for a new, smaller boat ride in the operational style of Jungle Cruise or Jaws. The ride could make a little circuit around the smaller island and under that rope bridge. It would have to encompass something other than a boat ride of course, I just haven't knuckled down what this would be. A show on the concealed part of the island or animatronics could potentially work.
Give a reason for people to visit the cinema. A 10-minute kids film played a few times a day obviously isn't the most popular choice. A return to IMAX with the addition of 4D effects could be the way to go.
Build an initial expansion of WhiteWater World of the size and scale that was planned years ago (see graphic below).
As part of a second WhiteWater World expansion, redesign or relocate the FlowRider shop/World Pass gate so that the area around the FlowRider could be opened up to encompass a new FlowBarrel on the WhiteWater World side. This would allow for after hours operation/events to utilise both rides. Since the initial expansion plans were released, there have been a lot of new slide types offered by the major manufacturers, so these should be built as the park extends towards Tiger Island.