Becoming the Pirate King can come later. Time to eat and party first.
Ceasar, Buffalo and Baby 5 have been fished out of the water and trapped in ice. Smoker allows the Straw Hats and Law to take the tanker and he has contacted the G5 Base for a ride off of the island. The G5 Marines managed to pry the method of counteracting the petrifying gas from Ceasar, and some of them plan to enter the lab again to save their comrades. Franky and the crew fix the damaged tanker ship, while Law uses his powers to remove the bad drugs from the kids and heal Mocha. The kids are then handed over into Tashigi's custody. Meanwhile, Brook accidentally drops the petrified Kinemon and he shatters, but for some reason he is only encased by the gas and survives. Momonosuke also turns back into a human boy and is reunited with his father. At night, everybody parties together and enjoys a banquet cooked by Sanji. During the festivities, Luffy declares to Law and Smoker that he is going to take down the Four Emperors.
They got the final party going, and so it looks like the Punk Hazard arc has come to a close. Doflammingo and some mystery guy are on their way, but at the moment the Straw Hat-Law-G5 Marine alliance get to celebrate their hard fought victory. Most of the immediate issues have been resolved. I don't get how Kinemon and Momonosuke miraculously returned to normal. Hopefully they explain that later.
With this arc in the books, the Straw Hats and Law will take Ceasar and challenge the Four Emperors. Kaidou was the Emperor that was using Doflammingo's artificial zoan fruit to create his army. Someone (Law) mentioned taking out Shanks, but I doubt Luffy and Shanks would really fight each other. Things could change though in a couple of hundred chapters haha.