Oh another thought ...look into the restaurants at Metropolitan. On a nice night, sitting outside, with a view of the city and the greenway it is really lovely. I believe there is a Hickory Tavern there that would satisfy the desire for burgers or La Paz has also relocated there if they prefer spanish/mexican. Right next to it is an interesting sculpture - a big reflective globe that makes for fun photos.
Can you tell to make it feel special I keep wanting to include a little "extra."