It's an open green space on top of a parking garage with great views of the city. There's also a bar area where you can get drinks and food, but no lounge per se, just the grassy areas and chairs scattered throughout. I'm not sure what the bar's hours are, but the park is open 7am-10pm in the summer and 7am-8pm the rest of the year.
Bar doesn't overlook the city. You can also plan a lil picnic and bring alcohol as long as you pour everything into a container.
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