Very carefully, I suppose? 

In fact this issue is a part of the training which all seasonal rangers get, even those of us who are volunteers. It has proven to have been a good thing since we find that it does happen, and not that rarely. 

On one occasion I was on roving patrol out near one of the walking trails when I heard a very worried voice saying, "Hello! Hello? Is anyone out there?" The reason was that some alligator had chosen to sun himself laying across the trail such that there was no way to get past, and no other route back to the parking area. On another occasion I was on duty in the visitor center when we were informed that an alligator was laying accross the paved walking area such that nobody could pass by in either direction without passing much too close to one end or the other of the alligator. Today, Pam was on roving patrol of the biking/walking trail when she was flagged down to deal with that very same issue.

 We have found that asking gently, "Mr. Gator, would you be so kind as to move your postierior?" does not usually have much results. What do to resolve the problem is to take a pole and approach the rear of the gator to tap him gently on the tail. The tail is reccomended since that end doesn't generally bite! In most cases, banging the pole on the ground near the gator will get him to move, but there are times when you must tap the tail to get the desired reaction. There are also times when the tap only gets a few steps and must be repeated, while still other times the gator is reluctant to move and lets you know that by hissing his displeasure, before he moves away. Thus far we have found that persistance has always worked, even when under protest. But one never knows for sure and this is a place where new experiences happen nearly every day!