Whoever originally said a tram road and tram service would make more sense, I've really come to agree.
It's definitely a greater ongoing cost, but the initial investment would be FAR lower than a parking lot and, if the decision was ever made that the full separation of Soak City wasn't the optimal choice, it's a much easier alteration to unwind. Additionally, upgrading the perimeter service road behind Old Virginia and part of Candy Apple Grove for tram usage is MUCH easier logistically than running a new, guest-drivable road all the way around the other side of the property to a theoretical new lot.
I could envision a new entry plaza with new guest services facilities, changing rooms, a gift shop, an eatery, and restrooms connecting to the current waterpark between Lighthouse Landing and Lil' Barefoot Beach. A huge advantage of this positioning is that you can maintain a Kings Dominion park connection via a new side gate that would connect to the path that runs to Twisted Timbers and Apple Zapple.
It's obviously a very rough, imprecise sketch, but here's what I'm thinking generally:
View attachment 40185
I think you'd want the tram to board within the park's main security loop to avoid duplicative security facilities and staffing. This general concept could accommodate new security facilities too though if needed.