Would like to see the information shop get more use, selling discount tickets on food/drink shops or specific rides. Maybe introduce guided tours and employ tour guides that can take guests exactly where you want them. That way you can re-introduce maps for sale. Vista points would be used a lot better in tours as well. Sun Cream/Umbrella's should make a come back also. They could also buy raffle tickets and have prize podiums set up for winners. A random number is read out on screens or from speakers once a day and winning guests would go to a small stage to collect a prize from an entertainer.
Quick thing about queue paths, make ride and queue entrances the same size as path entrances if desired, also the ability to toggle those small entrance pay hubs? on/off and the same for the employee's that stand next to them, introducing a swipe and pay wrist band system in information would benefit that.
Introduce play parks for kids. pay once and use slides, swings roundabouts etc.. buy picnics, employ singers/magicians etc..
Ok, bored of my own ideas now, i'm out!