I will be staying in zone 9 and want to go to zone 1 to visit the national palace, cathedral, avenida 6a street shopping and market. What is the best and safest way to get there and back. I probably can have the hotel to get me a reputable cab there, but how can I get a safe trip back? Any ideas? About what is the cost of taxi from zone 1 to zone 9? Is it possible to walk?