You're not the only one who didn't like "Stranger". Phil once said it was the beginning of Heinlein's "weird period" .
I enjoy metaphysical books by authors like Carlos Castaneda and Richard Bach. Always fun to think beyond the reality of physics, to look at the perceptions of reality verses the absolute truth. I still remember the ending of stranger. Exactly what would happen in real life.
I like some of his short stories such as "The Roads Must Roll" and the one with the dying astronaut on the moon.
30 pages in with Time Enough. My gawd, such a slow grind developing the character of a 2000 year old son of a bitch. Could have been done in 3. Starting to get a little more interesting.