Children in costumes trick-or-treat throughout the park. Must register for 1 of 5 slots (1/2-hr. slots): 11:30 a.m., noon, 12:30, 1, 1:30, & 2 p.m. Passes $7; Deluxe pass: $25. Carousel, train, & pony rides: fees apply. Howarth Park. 630 Summerfield Rd., Santa Rosa. srcity.org/2164/Halloween-at-Howarth.