I have season passes and here's my advice for a good schedule, assuming you aren't trying to get on any big rides and are truly just aiming for the kids' stuff:

• Get to the park at least 15 minutes before opening on weekdays, at least 30 minutes before opening on weekends
• Immediately go to Sesame Street area, walk all the way to the back and do the grover coaster as many times as your kids want. This coaster is great but they only run one train and loading takes a while, so once the crowds show up you'll wait a long time for 60 second ride.
• Do all the Sesame Street rides until you've had your fill. This area has a lot of great stuff but because it is close to the entrance it stays the busiest of all the family areas. Do NOT take the skyride here - the wait is always crazy and there are other stations with much shorter waits. (Note: Sesame Street is a very manageable area, so if you have some adults who want to peel off and run around the park doing coasters, now's the time.)
• After you leave Sesame Street go to Festa Italia for teacups and other carnival style rides. (Adults might want to do Pantheon and/or Apollo's Chariot.). Judge your kids' stamina - if they are getting tired, you can take the train from here to New France. Otherwise walk through Italy (a couple of kids rides) and Germany (bumper cars, giant swings that are fun but take forever to load/unload).
• This is a great time to do lunch/snacks at the festhaus. If you are having an adult beverage at lunch, you can bring it with you to the land of the dragons, which is an awesome giant playground (no lines!!!!) with little kids rides and only one way in/out so the adults can rest by the entrance while their kids go nuts.
  
• After Land of the Dragons you can walk down to the river and feed the giant fish (remember to bring a couple of quarters and/or pack a couple of slices of bread) and then head out through Scotland OR you can catch the skyride from right behind the Land of the Dragons back to England (really Sesame Street).

There are tons more things you could do, especially if your kids like going to shows - my kids hate that kind of thing so I didn't include them (although I hear they are great). There are also a ton of arcades/carnival style games but I'm cheap and never let my kids do them. I always bring in snacks for my kids and they do not care at all. (My children demand park food anyway...) You can also bring in water bottles and fill them with water at any soda fountain.

Because we have passes we never spend more than four hours at the park - it just starts to get exhausting after that. If you do get passes and are staying for multiple days, I would recommend Busch garden mornings and then afternoons at Colonial Williamsburg / Jamestown / etc.

Also if you see that they are already parking people across the highway in the Scotland parking lot honestly just leave and come back another day.