How do I invite my friends to play the game?
Adding Friends on Eden Isle: Resort Paradise can be done with or without Facebook. Enter the “Post Office” menu by either tapping on the letter icon on the HUD or the Post Office building itself.
To invite friends without using Facebook, when you've opened the post office, select the “Friends” tab and then select the orange “Invite” button on the “Invite Friends” panel. (To invite Facebook friends, simply tap the blue "Invite" button to select which Facebook friends to invite).
Tapping the yellow invite button will open the "Add Friends" panel. Tap the blue "Send" button to send your friend code to people.
You can choose how to send it, depending on what apps you have installed on your phone e.g. iMessage, WhatsApp, Mail, Twitter etc. Your friend will then receive the friend code. If they're not sure how to use it they can follow the instructions here.