We were not 100% sure what our two weeks renting a condo unit would be like, and it turned out to be much different that anticipated. Not only is Marathon in the middle of the chain of islands, but that also means you are in the middle of everything going on in the Florida Keys as a whole. Yes, we would go with the events. For example we would drive to Key West for the Wine Festival, and that got us all over the place down here. It was a hoot.
You can catch fish so easy in this town and we would recommend fishing from the bridges or even from behind your hotel. We stopped in at the Kmart and bought a pair of ready to go fishing pole kits for under $20 a piece, plus the frozen bait. The Kmart in Marathon has a huge fishing area all by itself. Kind of like a garden center up in regular Florida. Got to love the keys!
There are a number of cheaper priced condo rentals on the north end of Marathon in a little community called Key Colony Beach. We ended up there because of the price. It is harder to rent since most people do not recognize the name, but the location is excellent.
The city is huge and about 10-miles long. A very nice place for vacations and all family-oriented, lots to do, great fishing, and happy hours. In the winter there are lots of snowbirds.