I love visiting King's Dominion with my 8 month old and almost two year old. They love riding around taking in all of the action, and spending the afternoon in Lil' Barefoot Beach in
WaterWorks. There are areas where the water is only 6 inches deep, with a deeper area with a play structure for toddlers just feet away. I can stay with the baby while keeping the toddler practically within arm's reach, which is a necessity with two under two! The toddler structure has plenty of squirting water and toys, and it even has a slide like the big kids' pool. The slide is engineered perfectly where it's just long enough and the water is just deep enough to keep them from getting hurt, but shallow enough that they can immediately sit up without getting frightened by being under water.
Unless the adults in the family are amusement park enthusiasts with time to visit, the family pass isn't a great value with two small children. It's a nice addition to our Summer calendar, but if the passes hadn't been gifts we never would have gotten them.