We're (couple in early 40's) looking to spend a long weekend in Mexico City in late September. I've never been to Mexico before (despite living in Arizona for 8 years). We have lots of Marriott points to spend if there is a Marriott in a good location. We're interested in good food, walking around interesting and historic neighborhoods, and possibly good parks (I'm really into birding). I've read a bunch of forum threads but can't figure out which neighborhood is best (I've been looking at Polanco and Roma, but definitely not set on either). We wouldn't have a car and plan to use Uber.