Our first outing was to this amazing and unusual museum. I (Gideon) knew nothing of it, and we won't ruin the surprise for you either. Go see what I (G) call one of the top 5 attractions in the world, up there with the Grand Canyon and the Eiffel Tower, and where we had our first date.
If you're sensing a theme, it's that we like plants. This garden is one of the best in the world, with a series of themed collections, water features, and even a gigantic geodesic dome greenhouse (cool). Go see it while it's so beautifully in bloom.