Okay, question, serious question too:
Bride & Groom have lived together for years prior to engagement and marriage, already have the stuff for normal building household registry.
Wedding is destination, all gifts brought would have to be flown in/out, unless done via registry.
If not cash or a registry for cash ( money used for wedding/honeymoon experiences; couple spa treatments, beachside dinner, etc etc) then what would not be tacky?
Items for activities that you like such as if you enjoy the outdoors maybe a new tent and some sleeping bags along with some fun items for camping or fishing.
Novel board games
Movies
specialized cooking items that you do not have but would enjoy
list of local to you places to dine because gift cards for those are always nice to receive but if you don't have cheesecake factory in your area I would rather give you a gift card to applebees if I was invited to your wedding because I know you would be able to use it if that is what was in your area.
fun but not necessary items such as a heated recliner throw (ok maybe those are necessary if you live in a climate where it can get sub zero for weeks on end in the middle of January and February because they can fit around you and you can enjoy a nice Disney Movie or a Pixar One if you perfer.
Places that you would love club of the month gifts from such as popcorn, fruit basket, breads, cookies, ect.
For close family to give you things like a collection of favorite recipes does your aunt make a really awesome salad at every family gathering, does your grandmother make the worlds best cinnamon rolls, does your uncle have the most wonderful smoked turkey recipe you have ever tasted. Of a photo album of family memories such as those picture of the time you went taboggoning off the barn roof on grandparents farm with all your cousins into a pile of straw covered in snow or those pictures of you with all your cousins in a snow fort the day that the snow was chest deep on a grown man
A quilt square from each person or family to represent them if you happen to quilt or know someone who does might be a fun gift to receive.
Growing up we used to do tupperware showers for relatives that either they or their spouse was in the military and stationed away from us as they often were only able to come home for the wedding on a short leave. Instead of watching the bride to be unwrap all the gifts we would get together and wrap them in a group and then package them all together (we would put a who it was from tapped to the item before wraping it just incase a card came off