I think this would be a good model

http://www.google.com.my/imglanding?q=themepark&imgurl=https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgtS8SPBnke6HxT8hOt3iOPYBhk0Akwly9b-sxb30I30AqCvCn-m2aPysWqcr1UF6xAn6guyvj5eU1EqIRYdU1oEpaXVmtHDA-vjwJ1NkXXqyrSbl8C5XAK1rJxJk3XJT2FdoRPeLs1ec8a/s1600/ThemePark_Map.gif&imgrefurl=http://leisureandreclaration.blogspot.com/2009/11/escape-theme-park.html&h=534&w=800&sz=202&tbnid=Np1EIjVNtuzwHM:&tbnh=95&tbnw=143&prev=/images%3Fq%3Dthemepark&hl=en&usg=__vEqrUdNPbCbvI3IsmPek5n2OOKk=&sa=X&ei=G-4iTNarN4ulceLstKkF&ved=0CD0Q9QEwCA&start=0#tbnid=Np1EIjVNtuzwHM&start=1

entry by dom