I haven't even touched TS4 in a while but, i do want to improve the game.
For one, Sims 2 Freetime features would be great to add! I love that my sim has various hobbies, and the objects were always fun to interact with. like i love that my sims use the soccer goal, and the ballet barre.
2nd, Features from Bon Voyage and Island Paradise, would be perfect. As another user said, i love the hotel systems. Island paradise would also be good because for one sims can deep dive in water, not to mention have houseboats, and be attacked by a kraken!
3rd, I would love features like celebrations, where there is lavish things for weddings like various cakes and more objects, like a more festive wedding arch maybe, and of course more formal dresses, and nice colorful themed birthday cakes. Even more family themed items, or children items like the mermaid bed from family fun stuff.
4th, even more themed furniture, like a mix of ikea fun stuff, 70's,80's and 90's stuff, and maybe stuff based on an official store like an "At home" pack.
I would also love more music items, like how in ts2 we had a violin, drums, guitar and bass, and others can form a band and play together.
