Be carefull there is a part of the route that is a dirty trail. I rode with a cyclocross bike. The beggining is quite rough, then it turns much smoother. Get tires of at least 32mm width. Mine are 35 and are very good for that, I was doing a 18 mph average (actually I do the same on the road who knows...). Besides,at some point the dirty trail is blocked. It is advertised but I kept going. There is a small scale to go over some huge pipes (3 feet diameter at least) but lifting the bike was not that easy. But in overall I really like this route, the good thing is the whole route is very safe. Even Cardson road on a Sunday in the middle of the afternoon going South to Key Largo is very calm. There was much more traffic the other way. I went back to Miami via Express Bus 301 + bus 38 + metrorail. Considere at least 3 hours to come back.