We were there last month, and I still have the activities sheet.
We did rent bikes from Disney, and for the length of stay I believe it was $50 for the first 2 bikes, and $10 per bike for anything over. They did have daily rates also.
Many of the activities were free. Examples are: Pinckney Island tour, unbirthday party, toddler tales, music & lore of the Low country, campfire, bird watching, secrets of the marsh, behind the ears tour, beach nature walk, pirates of the calibogue, juggling, etc.
Craft activities were $10 for members, $12 if not a member. Some of these were gyotaku, bird feeders, spring flowers, butterfly houses.
Kayaking was $35 for an adult and $17.50 per child (adult must also go). The dolphin trip we did last year through Disney was $35 per person, do not know if that is the same. We did not do horseback riding.
There were also some programs done by Chef Gordon for members that were $15. We did not do that, but did do his "A Private Affair."
We did play tennis over at Palmetto Dunes, and that was $20 per hour court time. We did not golf, and I think those prices vary.
Hope this helps. I wish were going again soon.