I've played all over Florida as a "single" and it's something the courses and players are quite used to. Because of the high numbers of tourists there are LOADS of players in a similar situation.
The standard practice is to match you up with another group (or number of singles) to play in a 3 or 4 ball. I've never had any problems with a course, or with any group I've joined being "offish" about the situation. Players understand the situation and are friendly and welcoming in my experience. You might find the "Disney Classic" is on (or close) when you're there, it may limit your choice of courses a little.