New weapons: Spears (using the two-handed skill), whips (non-lethal, using the one-handed skill), thrown blades such as knives and stars (using the new thrown skill), lost race versions of these and all other weapons in Skyrim.
New clothing: party mask, animal head helmets like the bear heads the Stormcloak officers wear, Daedric amulets, Daedric lord clothing and hats.
New abilities: Singing and playing instruments (using the speech skill), boat and ship navigation. Writing letter and sending them to people through couriers, training wild animals and hosting parties.
Boats and ships can be piloted in the same way you can ride a horse.
Animal training would be where you whit the beast until it stops attacking and giving it meat.
You host parties at your home by telling the Steward of whatever hold your in and telling them what sort of party it is and when.
New critters: Snakes, boars, lambs, bulls, ants, beetles, crows and banshies.
New construction items: Daedric shrines, dwarven structures, ancient Nordic structures (including those doors that require claws to open them), looms for making your own clothing, breweries, dungeons, crypts, torture chambers, windmills, pools, hidden tunnels, hidden doors, traps, stone walls and battlements.
New people: children from all races. Farmhands, chefs, smiths, jailers and alchemist that can be hired for your house.
Misc: customizable underwear, because if you're going to invent underwear a thousand years early just so you don't have nudity you may as well make polka-dotted boxers. Just sayin. Mirrors that allow you to change your warpaint.