Bioshock Infinite Walkthrough Part 8: A Day At the Fair (Blue Ribbon Restaurant to Comstock Center Rooftops)
Once inside Booker can explore some. Directly in front of him is likely a Salt Phial. Head over to the right first and search the counter. You will find some Booze along with a few food items and a small number of Silver Eagles. Only drink the booze if you desperately need health as it will refill your health but drastically cut your Salt supply.
After that head over to the left. There are 3 Kinectoscopes: “A Look Back at Opening”, “The Prophet Stands Up To Foes: Within and Without!” and “We Secede from the So-Called 'Union'”. After that move into the bar portion of the restaurant. You will find that Odd Couple in there again. Search the tables to find a number of items. Likely in there are cigarettes. Cigarettes will restore Salts at the cost of Health. Just keep that in mind if you ever want to use them. You will also find a Small Salt Phial on the bar next to the man.
When you have covered the room approach the Woman and drink the aperitif. This will grant Booker a Shield, an electromagnetic force field that will absorb some damage as he is fired on. Apparently there was a chance just drinking that would kill Booker but he survived. Once you have the Shield then the Woman will move out of the way so you can head into the kitchen.
Inside the kitchen head over to the left and look on the counter. You will find the next Voxophone from Ed Gaines, “Half A Jew”. Be sure to search the kitchen for all the food you can. Remember that drink alcohol will restore your health but it will drain your Salts. This can be very bad as there is some fighting in the near future. Only after you are fully healed should you leave the kitchen. Head back into the bar if you need to find a little more Salt. Once through the kitchen you will find a dock at the bottom of the stairs. It is time to learn about using the Sky-Hook outside of combat.
When you get to the far right side of the dock look to the right and up. There is a red building that will drift into sight. Look for a hook hanging off the side of the building. It will glow green when you center it. At that point hit jump and Booker will be launched toward the hook. You can easily head back but it is recommended to press forward to the next hook. Keep moving until you reach the fourth hook.
When you get to the fourth hook look at the nearby rooftop and aim for the nearby enemy. When they are in the green targeting, hit the prompted button to launch at them and quickly kill them. This is a Sky-Line Strike and is very powerful though contextual. After that just turn to your right. Against the boxes you will find a Machine. Grab it to add it into your arsenal. Search the boxes to get some additional ammo then head down the stairs to the right of the crates.
At the base of the stairs look forward. You will see a Founder with a Machine Gun. He will call out to the nearby Police Barge that is floating by. Quickly possess him or just find some good cover and fight your way through the wave of police and him. Fight your way over to the right-hand side of this area and then into the small shed. From here you can easily look onto the barge. There is one target here, a Gun Automaton. You can either possess it to get its aid for a time or, from cover, shoot it down. Either way it will need to be destroyed for Booker to proceed safely.