IWe've been there in May and in August, and there are different types of walks. Some are family beach walks, free, and some are for a fee, Turtle Troop for kids. There are also walks in the area led by conservationists/naturalists who are licensed and can take just a limited amount of people.
Sometimes there were informative talks by Diseny naturalists from Animal Kingdom held in the evenings. I learned lots about sea turtles during our VB trips.