At AK, I like to watch the gorillas and talk to the cast members who know about the gorillas. Ask them which gorilla likes which other gorilla. It's like a soap opera. I could happily spend 45 minutes there. This is something I do when I'm by myself; my family and friends do not find it equally fascinating. I also like to take pictures of the animals.
At Magic Kingdom and Epcot, I like to go in the shops. Every. Single. Shop. This is another thing my family and friends do not find equally fascinating.
On the other hand, I do not like parades. Or It's A Small World. Or any ride which tends to make people motion sick. These are things I get to skip when I am by myself.