Chabot Space and Science Center
Your ticket includes a mind-expanding movie about the cosmos, some live music you can dance to, and access to the observatory and all of Chabot's exhibits. Current exhibits delve into the scientific achievements and cosmology of the Maya, give you a most likely dehydrated taste of the life of an astronaut, and take you on a journey to the farthest reaches of the cosmos, among other things. And—weather permitting—you'll get to spy on other planets from either Nellie, the 36" reflector telescope that allows access to 180 degrees of night sky, or Rachel, the largest refractor in the western U.S. You'll have four hours to amble through the science center with a celestial concoction in one hand (drinks are $3–$5 at the cash bar) and your date in the other. After staring into the depths of distant galaxies, you can stare into the depths of each other's eyes over dinner at the Starlight Bistro or Celestial Café (not included in Groupon; reservations required).