The half-priced ($20) twilight option from 5-10PM was fantastic! Our friends have season passes and take their little ones (4 and 2 years old) quite often on weekday mornings. My sister and I were coming in town from California with my nephews (3 and 1 year old), and we thought about stopping by sometime over the weekend. My friend suggested the twilight options on Friday, so we jumped at the chance. Cooler weather, less crowded, and just enough time to play for the little ones without the overly steep ticket price.
The park was a bit small, but again, good for the little ones. Parking was free and easy. We stayed for about 3 hours and felt that we got our money's worth. I wish we had the twilight option at our water parks here in California.