Whatever you have a passion for, then you must do. If you want to write, write about something you know about.
I wake up in the morning and I still have a passion for what I do, and I'll be doing it when I'm 105, I'll be scribbling away. If it was 100 years ago I'd be sitting by the campfire, saying, "Have I got a story to tell you."
I've never been on safari because I've got a phobia of bugs. I just don't want things crawling on me when I'm sleeping. It's a shame given my passion for big cats. But I really enjoy photography, so I'd love to photograph leopards in the wild some day.