Yes, comfort goodies. Highway pegs/boards and possibly rider/passenger boards if the bike doesn't already have them; a rider backrest and for sure a sheepskin or gel pad for the seat(s). The 1100 is in it's 30's now, so some accessories may be a tad difficult to source, but e-bay and goldwingparts.com etc are good spots to start.
don't forget the gold plated deer whistle. Seriously though, when I bought my fist Wing, an 85 LTD it had Markland highway boards and I loved them for straight line highway cruising. Going to add highway pegs to my 1500. Also depending on where you live, temps and season, I use an Alaska Sheepskin for winter riding and a beaded cover in the summer to keep my butt from burning up. It's amazing how much ventilation they provide.
I am still adding to my bike, with the highway pegs being first and then moving to areas that have to do with safety/visibility. I added a rear wing with modulating brake light, mirrors with the turn signals built in (muth signal), and driving lights. The cup holder I see as very important for riding in the heat - dehydration can get you before you know it, but of course a CamelBak would beat that.