I'd love to see a lawn mower, with actually mowing the lawns being one of the peep's jobs!
Building a shed in which to put gardening tools ( to be saved up for and bought )
A pond in the garden? as well as a slightly smaller Fish Tank and put the fish tank in the hall - not very hygenic to have it in the kitchen where they eat.
What about a greenhouse? They can grow all kinds of Isola plants in there!
Maybe a games room too? Toys for the younger children and pool & slot machines for the 14's and over?

I'd also like to see a 'Store' button that takes you to a screen where ALL items available to be bought are displayed. Where you can buy as many of one particular item as you want ( eg: hand wash, towelettes, energy drinks maybe even hair dye?) and a clothes store button taking you to a full screen selection where you can buy new clothes for your peeps.
Lastly I would like to see a garden center button where you can buy all gardening tools & equipment, upgrade fish tanks and buy seeds and pots, soil upgrades and ornaments for the greenhouse.