Big-box home improvement gift cards. HomeDepot, Lowes, etc. Pretty much everytime you go there, you can spend $100 before you realize it.
The KitchenAid stand mixer is a nice gift and appliance IF either of you cooks or could/would use a mixer. If you don't cook or would/could use it, then it just takes up a big chunk of space. If you do think you could/would use it, you can also put all the accessories that go -with- the mixer on your registry list(s). Like the cover, extra bowls, the food grinder, sausage stuffer, grain mill, etc, etc.
I second the decent hand truck with pneumatic (or semi-pneumatic) tires idea. It really does make life easier to use the wheels to roll things around than to have to lift-n-carry. Big boxes? Hand truck. Landscapes trees? Hand truck. Large rock? Hand truck.
If you like food/cooking, then things like the KitchenAid stand mixer (~$200+) or a good blender (~$100-$200) or a good food processor(~$200) would be nice. As well as good cookware. Well, even if you aren't a food nut good cookware is nice. As well as good cutlery, aka kitchen knives.
Some medium-sized decent capacity fire extinguishers, like 5 pound (fill) 3A-40BC class units. Those run ~$50 each. Putting a few in the house could run you $200+ easily, so that's a decent chunk 'o change but not overboard as a wedding gift per each extinguisher. The little 1A-10BC units are only ~$20.
Decent hand tools and some simple power tools (like a variable speed reversible drill, maybe cordless) as well, unless you really aren't handy or already have them. In which case you should find a handyman quickly.
Wet-dry vac aka shop-vac. But I would recommend a Craftsman 16 gallon detachable-blower wet-dry unit (~$100) over a Shop-Vac brand.
Oh, congratulations.