I was just out the back thinking about this the other day- we rent though and have no money so it was all dreams.. BUT...

A huge sandpit/cubby house kids area
A pool with lush plants all around it
A huge gazebo thingy over the top of our water tank so we can take advantage of the excellent views- the BBQ and outdoor seating can go there!!
a nice solid wooden fence all around the house to make it child escape proof
A really good chicken coop with chooks!!