Once you have researched the Drinks Stall, build several of them right away, as your guests will have likely complained about being thirsty by this point. Although much of your real estate is taken up by the two Inverted Roller Coasters, the water and islands should give you plenty of space for more large attractions to help you meet your high guest goal. If you continually expand throughout Years 2 & 3, you should reach your goal with surprising ease. Should you need a boost, whether to get your guest numbers up at the end or to spur revenue growth early in the scenario, don't be afraid to advertise.