The code gives:
20k gold 30 stamina 10 star coins
Code: aFGhsQDWGQnb
You get 5 diamonds from this Sharing button and it refreshes every day.
There are two ways to Rank Up and get to this button. You can either get it in Stylist Arena or by doing a quest in Nikki's Journey. You need to do them both manually. The easiest way is to go to the Stylist Arena, click Find Stylist and then Start. If you win you're guaranteed to rank up. The other way is to do a quest manually in Nikki's Journey. If you manage to get a higher rank than before you will get the Rank Up and be able to Share.
After you push the Free Dressing button you can find the Share button in the lower right corner. You get 2 diamonds from Sharing and it refreshes every day.
After you push the Competition button and then click Change you can find the Share button in the lower right corner. You get 2 diamonds from Sharing and it refreshes every day. You don't need to join the competition in order to share.
After you push the Go Home button and gets to your Home you can find the Share button in the lower left corner. You get 2 diamonds from Sharing and it refreshes every day.
The Daily Quests refresh each day. Here it's possible to get 65 Diamonds daily. Even if you're not using money on the game you will always be able to get enough Activeness points (150) to get all the Diamonds.
I really liked Everyday Adventures from Lonely Planet. It's about simple, and some cheap, activities you can do in the area you live. Or you can do them while traveling. I found it quite inspiring and it gave me ideas about what I can do where I live and not to only be adventurous when I'm out traveling.