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Nobody doesn't love sea lions. At least, no one worth dating in any capacity, so, test number one. This is already so efficient! Anyway, at the Prospect Park Zoo, public feedings happen for the sea lions three times a day, and are not to be missed.
In and of itself, this isn't long enough to constitute an entire date, but it does put you a short walk from tons of bars and restaurants, and two-part dates are almost always a good idea. There's no easier, more painless way to gauge a person's interest than seeing whether or not they feel like coming to a second location with you. Always try for the second location.