Theme Park Studio looks like the game that RCT fans have been looking for. However, they need some KickStarter help. They need $1300 with only 5 days to go. Some nice perks if you decide to help out.
http://www.kickstarter.com/projects/1011099242/theme-park-studio-create-the-ultimate-theme-park
http://www.kickstarter.com/projects/1011099242/theme-park-studio-create-the-ultimate-theme-park