There are usually multiple strategies to successfully completing a scenario; these can be discussed on the scenario's discussion page or written down in an existing or additional section of this article.
Start off the park by building a few flat gentle and thrill rides, and one cheap roller coaster. Also, raise the entry fee to $25 and get rid of the extra paths. Don't bother buying more land at all, because the amount given is about 50 times bigger than the amount needed. Throughout the scenario, just slowly add rides. The objective is not difficult at all. In fact, this park is easier than Victoria Falls.