This park requires a whooping 3,000 guests in just 4 years and it is much harder due to it being a "pay for entry" park. But, if you remember to build shops and stalls as much as rides, money would not be so much of a problem. You may even make some money every month if you have enough of them to satisfy your guests as well as your bankers. Next, delete one or two roads at the airfield. This would bring you some fresh bills, with which you'd build another roller coaster and raise the admission fee to $15.00 - $20.00.