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Located about 30 miles from Washington D.C., SplashDown Waterpark is open from late May to September. Hours vary, but the park is generally open 12 pm to 6 pm at a minimum. Admission is $15.75 for children and adults over 48 inches in height, and $11.75 for children under 48 inches. Daily locker rentals are available and lifeguards are on duty.