Things to do before I leave?

Been here for 6 months for work and honestly havent gotten out much except for concerts. Might be leaving again in the next 2 months or so but wanted to collect ideas to try before I do.

• Galveston – yet to go to the beach, any specific areas or must do's?
• Downtown – museums or Zoo worth it?
• Food – any special food that Houston is known for?

Any other ideas you guys have I'm open to as well! Thank you