The gate is located in the heart of the city, so it's easily accessible by taxi. Berlin's taxi service is generally reliable and efficient, but do keep in mind that traffic can be heavy during peak hours. The Brandenburg Gate itself is a stunning piece of architecture with a fascinating history. It's a symbol of unity and peace, and it's particularly impressive when lit up at night. There are plenty of information boards around the gate that provide historical context, and you can also hire a local guide for a more in-depth understanding.
In terms of food and drink, there are numerous cafes and restaurants nearby where you can sample traditional German cuisine. If you have time, I'd also recommend exploring the surrounding area, which includes the Reichstag Building and the Holocaust Memorial.