It's funny you should mention that - I do indeed have a bucket list
Here's is what I have crossed off :
Sky Dive - did that once about 10 years ago would do it again (kids now want to try)
Scuba Dive - The kids I got Padi certified last year (wife not a big fan of boats and underwater haha - but loves the beach !) - went to Mexico and had 6 dives (4 were for certification , two actual dives) - Love it - going back this year for at least 2 - 4 more dives
White Water Rafting - this is the 4th time I have gone and will go again next year (Fortunate to live about a 6 hour drive from one of the best rivers in the world)
Zip Line - did that this year same trip longest was 500 meters over the kicking horse river was a blast
Ones left on the list
Night / Cave Scuba diving - need a bunch more courses and dives may not get time.
Bungi Jumping - this one has me a little worried now that I damn close to 50 - I could surive the thirll I am worried about my bones on the jolt haha that one may remain on the list but I think I will do it. (and like you Gary I have had back issues off and on last several years)
Base Jumping - on the list not sure I will get it crossed off
Travel - Austraila #1 on the list , Europe (I was in Sweden for three days don't really count that was a work thing) , France - I was actuallly born in France left at 6 months old, Alaska , China are tops.
Bunch of other family type stuff - give my daughter away at her wedding, grandkids , great grand kids etc ...
Those are few off the top of my head I don't think a bucket list is ever finished .