Hints and Tips

Adding scenery and water near rides increase the excitement rating.
Coasters that are very high are generally too intense for most guests and waste too much money. Coasters do not need to go very fast to be exciting.
Try to make your park as dense as possible. Having rides with tracks going near other rides dramatically increases the excitement rating, meaning you can charge more and earn more money. Guests will also spend more time (and money) the less time they spend walking.
An organized path system with logically laid out rides make it easier to navigate, keeps guests from getting lost, and keeps your park rating high.
Scenery near your Path Items reduces the likelihood of them being vandalized.
Long queue lines make the wait time longer and reduces the happiness of your guests.
Don't make huge shopping centers. Guests will only buy one drink, one food, or one item. Just make a food stall, drink stall and bathroom.
Raise the price of umbrellas to $20.00. Guests will buy them if it's raining regardless of the price.
Name sad guests Melanie Warn, then revert their name. They will have full happiness. (see cheat codes)