friendly — characteristic of or befitting a friend; showing friendship: a friendly greeting.
fun-loving — enjoying life in a lively, lighthearted way; spirited; playful: fun-loving friends.
participating — to take or have a part or share, as with others; partake; share (usually followed by in): to participate in profits; to participate in a play.
sociable — inclined to associate with or be in the company of others.
gregarious — fond of the company of others; sociable.
