Talk:FAQ/@comment-89.98.94.116-20130605083016/@comment-5709722-20130605085918

That's the currently best guess:

http://paradiseislandhd.wikia.com/wiki/Quests

So basically if you collect 100 shells, you might have gotten 20 pearls and about 6 rings too.

Collecting income from buildings and repairing them will also drop ressources. The best building i know is the Hot dog stand.

If a ressource is dropped or not is random at different drop rates. All you can do to influence your amount of ressources is collect as many profits and help as many tourists as possible.