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.
While the objective and the open space in this scenario seem to make the task rather easy, the difficulty comes from the disability to take a loan. Luckily, there are some pre-built rides, but the first step to make is relocating all the underground paths to the surface for a better overview. Now, price the pre-built rides, gentle rides about $1.00-1.50 and thrill rides about $2-3. Next, open everything besides the Maze because guests are likely to get lost there and the queue time will be too long even after it has been shortened. What is worse, is that the Neptune Ride and Maze cannot be removed, so later in the game, it becomes neccessary to reduce their prices.
Start slowly, mark thrill and gentle rides on research, and put the missing thrill and gentle rides that are available to build. Price them at the same system, too. Now, if some money is left, build the Junior Roller Coaster and price it at $5. Now wait for money to accumulate, while placing benches as well as mechanics andhandymen. An income opportunity would be selling the temple which totals to $40,000.
After ride tickets sales reached $5,000, start researching roller coasters, building them, and pricing them at $5 to $6 as well. Make sure to put in a few Cash Machines around the park so that guests will keep going on the rides. In the end, this strategy should make beating the objective with a park value more then needed easy. Eventually, the scenario is pretty easy while it is a struggle to fill all the space on the island in time. Buying more land is not advisable, since it is expensive and you will beat the scenario before.