Free entry: General entry to Cacapon Resort State Park is free: there is no entrance ticket, timed-entry reservation, or state-park admission charge. Ordinary visits do not require a booking. The seasonal swimming beach charges admission; the official source does not publish a free age category.
Sold out? Park entry does not sell out. If a paid activity is unavailable, use the open trails, picnic areas, lodge restaurant, or visit Berkeley Springs; for Wobble Clays, reserve with the park in advance.