From the Woodland Park Zoo web site:
Dinner reservation? Check. Verified movie times? Check. Babysitter? Uh oh. Don’t fret—let Woodland Park Zoo handle childcare for you with our brand new Parents’ Night Out program. Kids ages *4-11 will enjoy a fun-filled and educational evening under the supervision of zoo staff inside Zoomazium, while you enjoy a night out on the town. Supervised activities for kids include games, puppet shows, movie, and a live animal encounter, plus a tasty pizza dinner!.
It’s for potty-trained children 4 – 11 years old, and costs $25 for each child (+ $20 for additional siblings) and 2010 nights include February 6, March 6, July 17, August 27, September 24 and November 5th. See the Woodland Park Zoo web site for more info.
Another option for older kids (grades 2 – 6): the Pacific Science Center does occasional sleep-overs. Unfortunately, they had to cancel their Valentine’s Day one due to lack of interest, but we definitely took advantage of their New Year’s Eve sleep-over.