Miami and Key West.

Hi Steemit.

I need help. I'm going to Miami in september with my boyfriend, but only for one week.
We have never been there before, so what to see, eat and where to stay?

On my list I have:
Miami Beach (one night, is it enough?)
Everglades (with an airboat)
Key West (one night, again...is it enough?)

It has to be pretty cheap, but not hostel-cheap. We already booked two night in Palmetto Bay (with Airbnb), does anyone know this area? :-)