Get her a tandem paragliding ride at Torrey Pines.
Weekend trip to Hearst castle.
But for the TRULY spontaneous and romantic idea. Take her trap shooting at the miramar trap and skeet range. That never fails. Even if she has never shot a gun before. I know, I know it doesn’t sound romantic, but it really is.
You can follow that up with drinks at the top of Top of the Hyatt, it has the best view in downtown.