Princess Embarkation Question for Buenos Aires

We are headed out in a few weeks for the South America cruise on the Emerald Princess, and wondered if anyone had any recent experience as to the following:

1. We board on the 31st, but the ship remains in port and leaves the evening of the 1st. Since we are coming directly from the airport on a Princess transfer with no opportunity to stop, once we have boarded, can we leave and bring on our free bottle of wine on board later that day or the next day?

2. What is in the general area - walking distance ideally - of the cruise terminal in terms of market/wine store. Apart from picking up the wine, we are looking for some permitted beverages to take on board.

3. Any flower stands in the area of the cruise terminal?

4. I have read about some of the "incidents" in BA to watch out for, but any specific warnings in terms of using taxis to go into the city, including for dinner?

Thanks for your input. :D