I found this BBC list of 50 Things To Do Before You Die. I'm doing pretty good on it, I think. I'd break it down this way:

Done:
1. Swim with Dolphins
12. Climb Sydney Harbour Bridge
13. Escape to a paradise Island (I'd count Tioman, definitely)
15. Go white-water rafting
24. Ride a motorbike
40. Ride a rollercoaster
42. Go paragliding
47. Visit Walt Disney World, Florida
48. Gamble in Las Vegas

Will do, someday:
2. Scuba dive on Great Barrier Reef (though there are plenty of just-as-nice places)
4. Go whale-watching (seen a whale, but not as part of a trip)
5. Dive with sharks (missed a great chance in South Africa)
7. Fly in a hot air balloon
9. Go on safari
10. See Northern Lights
11. Walk the Inca trail to Machu Picchu
14. Drive Formula 1 car
16. Walk Great Wall of China
20. Grand Canyon helicopter ride
22. See elephants in the wild
23. Explore Antarctica
27. Wonder at a waterfall (well, a REAL one)
29. Explore the Galapagos Islands
30. Trek through a rainforest (sorta done this, but not really)
32. Ride a camel to the Pyramids
36. Climb Mount Kilimanjaro
37. Fly over a volcano (I've done this from a distance, but I want the close up experience)
38. Drive a husky sled
39. Hike up a glacier
45. See tigers in the wild
49. See orang-utans in Borneo (hopefully very soon!)
50. Go polar bear watching

Would do, but doubt i'll ever be able to:
3. Fly Concorde to New York
8. Fly in a fighter jet
26. Climb Mount Everest
28. Go into space (would drop everything for a chance)
33. Take the Trans-Siberian Railway, Moscow to Vladivostok
43. Play golf at Augusta, Georgia
44. Watch mountain gorillas

Already chickened out on:
6. Skydiving
17. Bungee-jumping

Surely would chicken out on, given the chance:
35. Go wing-walking

Huh?
18. Ride Rocky Mountaineer train
46. Do the Cresta Run, Switzerland

Don't care that much about:
19. Drive along Route 66
21. Ride the Orient Express
25. Try ranching
31. Gallop a horse along a beach
34. Catch sunset over Uluru
41. Fish for blue marlin (though I'd love to see one)

I feel good about this list not for the things on it that I've already done, but because there's so many things on there that I'd like to do, and are potentially within reach. And of the nine on there that I've done, six happened with Marjorie, just in the last 5-6 years. What a gal...