Can I become friends with other players who have visited my campsite or helped out in my garden?

You can send a friend request to other players who have visited your campsite or helped out in your garden by doing the following:
 
❶ Select Social.
❷ Select Visitors.
❸ Select the player that you want to send a friend request to.
 
If the other player accepts your request, the two of you will become friends.