Do you like bars where the drinks are stiff and the waitresses are stern, yet strangely alluring? You’re not alone. The Loon is open 365 days a year and typically packs in the twentysomethings Thursday through Saturday nights, when there’s a line out the door. Best place to perch: Anywhere you can find a spot. Fireplace is prime real estate. What to wear: anything goes. Hats and tennis shoes are allowed. Best nights: any night of the week.