I'm not a fan of either. An obituary is fine but it will instruct those that would normally come to my funeral to go out and participate in an activity that we enjoyed together and keep me in their thoughts when they do it.
I'm also leaning towards cremation with two urns. One will be given to my family to be spread at Alta and the other given to a friend to spread at Lake Powell. The last thing I want is for anyone to be visiting my grave on Memorial Day. I'd much rather they be out spending time with family or friends doing something fun.