Hudson Terrace: After operating as a private event space last year, this gorgeous bi-level aerie with the commanding Hudson River views opens to the public for the first time tonight with a Cinco de Mayo bash. Tented on rainy nights and featuring a heated floor to ward off any early-season chills, Hudson Terrace will now be doing happy hour parties on Tuesdays through Fridays, as well as Sunday brunch (from 2 p.m. to 8 p.m.) with a menu from Vintage Irving's executive chef Jason Bunin. The happy hour deal is good for 2-for-1 specialty cocktails, and an extensive nightly appetizer menu includes duck confit quesadillas, crab and artichoke croquettes, and smoked salmon nachos. A rooftop BBQ grill will also round out the edible options (tempura chicken skewers, anyone?), while beverages run the gamut from wine and sangrias to margaritas, mojitos, and caipirinhas. Or just get two Jim Beams and Coke for the price of one and savor the sunset. 621 West 46th Street, (212) 315-9400

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