W.C.
While it is true that this birthday is for you and nyour family, as long as you have a quiet place for him to take his naps at a scheduled times, live it up. You could do a cute bug and ants at the picnic theme. Big ants made of black balloons, butter flys and caterpillers can all be made of balloons too.
Cute creapy crawly things- checkered table clothes, balloon buggs and picnic fair
Cowboys- red bandanas, ponies, rope decorations
Trains, planes, and automobiles
Blue #1- there are all kinds of simple decorations for this one
Country fair- any food on a stick or in a bun
Luau- and all that comes with it
Storytime- The adults can gift a favorite children's book. You can set up a quiet area to video record the adult reading the book to your little one. great and meaningful keepsake.
We had a luau and kept on our regular feeding and eating schedule, but the adults just went about their business. We wrote thank you letters to all of the people that helped us through our first year and each grandparent got a charm necklace or tie bar designed by my uncle, who was our family jeweler.
DD likes the pictures, but of course doesn't remember it. It is for you and your loved ones, so have fun with it.