You can get this pin by participating locally (depending on your language setting) in the Room Season event. This event starts every month. Here you can create a new room and publish it for everyone. This room will automatically participate in this Hotel Hideaway contest. 

This is the amount you need:

Level	Participated
	2x
	6x
	12x
	24x
	48x

After reaching the 5th level, you can level this pin again with the same number. After that, the color no longer changes, but a number appears on the pin. This shows other users how many times you have reached the last level.