Don't make the queuing too long or guests will get unhappy. Don't make them too short or you wont get as much profit on the ride. Use 8-5 places for queuing lines.
If you have experience on the game make your own RollerCoasters.....they'll be more intence and will be better!
Keep handymen asighned different places so your park will be cleaner and more orginized!
When a ride crashes and people die once the ride is fixed make free ride coupons so more people come!
Do not make "food courts"! The businesses will compete against each other and none of them will profit well. Keep food vendors separate from each other.
It is good to put a drink stall of some kind just a short way from the exit of an intense roller coaster. The guests need to quench their fear induced thirst!