Celebrating 55 My Way

I'm getting ready to celebrate my 55th birthday, and am trying to decide what I want to do to mark this milestone. Ryan and I hiked the Grand Canyon from South to North to celebrate my 50th, and that was a wonderful (and exhausting, and in some ways scary) way to celebrate. I don't need to do something that major this year, but I am ready to take on a challenge.
I've survived and learned to thrive again during these past 5 years, and I want to celebrate my accomplishments with a multi-day project. I'm trying to decide between hiking the High Rim Trail between Highway 33 and Vernon, or biking or hiking the Kettle Valley Railway between McCulloch and Naramata - or, since I've already biked and hiked from McCulloch to June Springs, maybe I should do something else. I just can't think what else.

I do want to be outdoors, to be able to take pictures, geocache, and see only a few other people. However, I don't necessarily want to be all by myself very much of the time. The perfect situation for me (not necessarily for the others in my life!) would be to have my kids, and maybe some of my friends, take turns hiking or biking with me along a trail that I do. I don't have to camp along the way - regular road access to the trail would make coming home in the evenings easy.

Does anyone have suggestions? feedback? any volunteers?