It was the best of times, it was the worst of times.... Ha Long Bay has my favorite Thai food in Madison, but I never go in person anymore. I only ever order takeout and pick it up. I absolutely recommend this route, bc the food is great, but I can't recommend the restaurant to anyone without a warning: the service is so, soooooo slow. Long waits to get seated, zero space to wait in (more than ~3 people and you have to wait outside), and hideously slow service once you're seated. Not rude, not inaccurate (in my experience), just infuriatingly slow. DO NOT GO IF YOU'RE ON A TIGHT SCHEDULE!
And when you do manage to get your check at the end, go pay it at the register. You'll avoid another wait AND you can pick up a few of the lychee hard candies from the big bowl. Those things are delicious, and you deserve them.