Aquarium of the Pacific in Long Beach is hosting a FREE Shark Lagoon Night on every Friday 6-9 PM. Not only will you see all kinds of sharks, but also TOUCH the bamboo sharks (bring your camera!). A live band performs every week, with this Friday night, Nov 6th, being jazz music. A snack and beverage bar is onsite, but I suggest going right before dinner when it opens at 6 PM or stop by after dinner. There are plenty of eateries and things to do nearby at The Pike or on Pine Street.
UPDATE 01/07/10: As of today, the calendar shows it's free EVERY Friday night through May 7th.
UPDATE 01/28/10: @AquariumPacific informed me that this event is almost every Friday. I see that the current schedule shows that the last Friday of the month in January 1/29 and February 2/26 have been replaced by "Night Dive".
UPDATE 04/27/10: If Fridays don't work for you, get 2-for-1 admission anytime thru May 19th with this BOGO coupon (print HERE). REMINDER: LAST free Shark Lagoon Night on the calendar is May 7th!
UPDATE 10/01/10: Free Shark Lagoon Night is back for the rest of 2010! It's almost every Friday, so check the online calendar. Thanks to @matthewdiluzio for the reminder! Click HERE for the schedule.
Approximate cost of creative date idea = FREE + $7 parking.
Actual value of the cheap date idea = $48 total ($24 per regular admission ticket!).
Click here for map