A large park would have 8 segments, medium 6, small 4, etc. This allows the guests to easily find what they need when they need it. The longer they need it the more unhappy they become. Also buddy shops up, place a drinks stand by a fries stand. Finally by every shop that sells a food item of any kind, place numerous benches, and a few garbage cans.
People like to sit when they eat.
Your saves will still be there, but your progress through the scenarios is gone.