Be sure to demolish trees sparingly, as it will cost you excitement ratings on the rides (trees are also scenery) and it will cost you a lot. Instead, try to build around all the trees with lots of custom made rides. Start slowly with the available flat on-tracked rides. After you have enough cash, you can start building coasters. For every coaster, do a campaign for the coaster and the rest of the scenario will be easy cake. The limit of the wooden rides only sounds pretty challenging, but beating the scenario is not hard as beating the Amity Airfield scenario.