1.No advertising is available for this park so you won't need to spend any money on that.
2.To make up for no advertising put a fee to get into the park to make a fast buck.
3.Put in shops and stalls where and when needed.
3a.I would double or even triple the price on umbrelas to make up for no advertising available to use.
4. Have alot of workers in you park to clean up the puke and fix the rides. That will improve the guest count alot.
5.Build small rollercoaster or water rides in your park. There is not too much land to work with.
5a.The more rideable these rides are the more people will show up.
6.Add in a bunch of non roller coaster rides for a little flavor.
7.One new ride every six weeks should do you fine to keep the peeps
happy.