Old San Juan is just a few miles across and has minimal public parking, so walking is a sensible idea in this area. Many of the forts are set off from the main road and require a 1/4-mile to 1/2-mile walk even if you have a car.

However, driving is the typical way to get around and between the other districts, and most car companies have rentals available at the airport in San Juan. You can use a valid drivers’ license from any country, and traffic moves on the right, as in the United States. Speed limits within the city are usually 55 mph for wide boulevards and 30 mph on narrow or residential roads. Keep in mind that speed limit signs are in miles but distances are in kilometers, which can be tricky. There are plenty of gas stations - gas is sold in liters and is often self-serve.

Buses and taxis are reliable alternatives to renting a car. The Metropolitan Bus Authority controls routes in San Juan, and stops are indicated by colored signs marked Parada (stop), sometimes bearing the logo AMA (the Bus Authority’s Spanish abbreviation). Taxis have regulated rates in designated tourism zones, and these are posted here.

If you are arriving in San Juan by cruise ship, you may not actually need another means of transportation, as the piers are all within walking distance of Old San Juan.