I found that the Caloosahatchee Regional Park (which actually has a half marathon and 5k race coming up) and decided to give it a go. The directions from the website were great and I had no trouble finding it. I put 3 bucks into the pay station and set off.
I worked at doing the loop faster the second time and did by about 2 minutes. Then the third loop was a bit of a challenge. My ankle started to feel sore, I was very sweaty and in general tired. I worked through it at a slower pace (which is okay according to my smartcoach)
About a half a mile from the end of the loop, I heard a very very large scrambling of an animal. I couldn't see what it was but my gut reaction was an alligator so I took off. I sprinted as fast and as far as I could go before getting back to my car. At that point, I decided to call it. No one else was on the trail and the thought of running into an alligator was more than I had in mind for this run.
It was obviously less than I planned and will try again on Tuesday to get those miles done in order to stay on track for RnR USA.