I would put the Berserker as a "must see activity", but it really isn't much of a ride. It is a Viking ship on a pendulum that builds momentum and suspends riders upside down. Yeah, they strap you in well, but they must make a fortune from the loose change that falls out of people's pockets, as if the park's confiscatory prices aren't bad enough.
It isn't bad enough that they don't let you bring your own drinks in. King's Dominion makes the water in the drinking fountains warm enough that it won't quench your thirst so you will be forced to pay their confiscatory prices for drinks.
Fun Alternatives: I'm afraid the park has made you a captive audience.