"Beach Blanket Bonding" is an orchestral piece on the Season 3 soundtrack. It plays as Jack returns to the beach after his stay with the Others.
Sawyer notices someone returning to the camp. Sun calls out "Jack!" and runs to meet him. Jack greets various survivors including Hurley and Charlie then shakes hands with Sawyer awkwardly. Finally, Sawyer embraces Kate. Sawyer then notices Juliet, who came with Jack, and asks what she's doing there.