What I have:

so far I have my house which has three floors three balconies and a basement. I have a 5 sugercane farms, 5 cactus farms and 5 wheat farms. I also have 2 aerial mob spawners, one land mob spawner but has 7 layers, three underground mob spawners that connect using water come up to land for view through glass then fall to there death at bed rock and 1 mob spawner where I have to kill them personally.

What Im going to build:

Mushroom farm
Tree farm
yellow/red flower farm (if its possible never seen one though)
rail station
rollercoaster (maybe, undecided.
leisure centre (gym and swimming area with shower)
slime farm
boat house
about 10 houses but every two will be a different design
nether portal builidng
secret railway which will open up a large mountain door which will then ride over a lava drawbridge and into a secret layer - all done by redstone/sticky pistons.
automatic farms

If you have any other ideas please comment on this topic!
Im not that good at building so I dont have the skill yet to build massive projects like a castle or a tower (to me thats big haha)

Much appreciated <3