Well, the only reason I put out the caveats is because most people who enjoy Heinlein in general tend to have some reservations about those. Though
I Will Fear No Evil had to grow on me as a whole, I did always like the humor;
Time Enough for Love has always been a personal favorite -- though there I also caution because it really is better read as the capstone of the Future History series (well, until
The Number of the Beast,
The Cat Who Walks Through Walls, and
To Sail Beyond the Sunset took that particular series even further).
Also, something I should have mentioned earlier, in connection with
Stranger:
Red Planet, though one of the juveniles, has some connections with that novel, both thematically (certain aspects of the philosophies explored, especially in relation to the Martians and immortality) and concerning the milieu -- thematically,
Red Planet (or certain aspects of it) can be seen as a prequel to
Stranger, while chronoligically (within the story)
Stranger is a prequel to
Red Planet! Also, thematically (immortality)
Beyond This Horizon also has some similarities to certain aspects of
Stranger in a Strange Land as well. (And now, darn it, I want to go dig my Heinlein out of storage and reread them....
)