The Collection is a Canned Snake, a Dribble Glass, Fake Vomit, a Finger Trap and Itching Powder.
This gives the very nice reward of 200XP and a Debris Cactus.
Just like the previous St Patrick's Collection and Spring Collection these items can drop from ANYTHING you do on yours, or your neighbours homestead throughout the whole of April.
There's also a series of five April missions, for all the info click HERE.