My best friend always made a big deal over my birthday. After she died I decided to plan something for my birthday every year that I wouldn't ordinarily do in honor of her memory.
The first year I went skydiving. (I only meant to do one, but it turned into 718 skydives over 7 years. Many birthdays after that included skydiving trips.) I've milked a cow, gone to Disneyland in California, took a quilt bootcamp in Colorado...
I'd still like to ride an elephant and a camel. Riding a donkey down the Grand Canyon has always been on my "want to since I was a kid" list too.
I'll have to keep adding things once these are accomplished. My best friend is worth honoring every year!