...and what, exactly, does that mean to you, preparation-wise?
For instance, I tend to play much, much better on difficult courses when I take the round seriously and thus prepare to play the round by:
1) Settling on a club and shot-shape for EVERY par-4 and par-5 tee shot the night before. I will even write this down in a notebook. (this can change due to wind conditions or tee placement, of course).
2) Write down thoughts on particular holes including good places to miss and places to avoid on each hole.
3) Spending plenty of time hitting 2 and 3-foot putts prior to my round
4) Spending most of my warm-up time with driver, wedges, and short game.
Architecture-wise, I would think that number 1, above, fits right into good architecture. If I have to think a lot about exactly what clubs I'm hitting on every hole, then that means that the course at least has variety and some risk/reward going for it, which is nice. Same goes for the notes on where to miss and not miss.
So let's hear it: How often do you take a round seriously, and what do you do to prepare prior to playing?