Giving this a three star mainly because of the traffic noise. If you're a light sleeper, this will keep you up til the traffic dies down. Great location for $50 just 40 minutes east of Key West. Best camping deal on keys, just be prepared for traffic noise.
Chose the primitive tent camping a day in advance and was informed by everyone that I was lucky to get a spot. The spots book up fast and sometimes require as much as a year in advance.
First thoughts on entrance. Fantastic. The park rangers were more than helpful not just for explaining the layout of the key and where to go but several recommendations on what to do while there.
One thing not advertised was the starlight. If you camp or stay overnight be sure not to short change yourself and go to an unlit area of the key, away from the road to look at the stars. If you have never been away from the city you will be surprised at how much your world changes away from city lights. Enjoy the moment.
Dog friendly and incredible geocaching on the island. For anyone just starting out geocaching the key has nearly 500 favorite points on the five caches, all of which can be found quite easily by a beginner.