Diamonds - What is the easiest way to get lots of diamonds?

Easiest way is purchasing them, of course. If you don't want to spend, the next best way is exchanging bushes with other players. You can get a max of 14 diamonds per day or 98 per week by harvesting these bushes. Some clubs have full exchange schedules, so that members can get maximum exchange. In addition, a club that actively participates in the Detective League will get weekly diamonds.

Beware of websites that offer diamonds. If the game detects you have visited sites that offers such, your lounge chair will be removed for "suspicious activity."