Romantic spots when cost is no concern
Since this is a honeymoon, and without knowing your budget limitations, here are those places my wife and I find "special" along your potential route.
One of the B&Bs in Pacific Grove (wedged between Monterey and Carmel). Some of these have ocean views (my choice), all have great breakfasts and nice lodging. Can hit both Carmel and Monterey easily from a base in Pacific Grove.
Cambria, at the far end of Big Sur. Some very nice motel/hotel options, along with a decent selection of restaurants and shopping.
Any of the high-end National Park lodges: Ahwanee in Yosemite, Furnace Creek Inn (not Ranch) in Death Valley, El Tovar in Grand Canyon. You'll need to book these ASAP if you want one of these.
Here's the pool at Furnace Creek Inn:
http://donandlindacasey.com/images/FCInnPool.jpg
Photo: Don Casey
Ocean along 17 mile drive in Carmel, similar to what one would see in Pacific Grove or Cambria:
http://donandlindacasey.com/images/O...7MileDrive.jpg
Photo: Don Casey