Ok, let me first welcome you the DL boards!!!
First of all read all of Hydroguys stickeys at the top of this board. So much good info for WDW vets! A MUST!!
Staying at the Grand Californian will be super. Yes, you get to walk right into DCA from the Grand. From DCA you can walk right to DL. Maybe a 2 minute walk across the Esplande. From there you can walk back to the Grand via DTD. It's all right there, all walkable, which makes it alot of fun! THe lobby is beautiful, and someone is usually playing on the grand piano. There is also storytelling by the big hearth. I love the Grand!!!
The Monorail does run through the Grand, but does not stop there. It just for looks.
If you could, I would definitely try the Napa Rose. I have only done the lounge for wine and desserts, but the restaurant looks fabulous. Alot of people including me, love Whitewater Snacks which is part of the Grand. We love to get breakfast there first thing before hitting the parks.
While at DCA, the Wine Country Tratatorria has great food and a great place for eating outside and sipping wine, if you like that kind of thing. Last time I was there, I tried the Pizzetta ( Salad on top of a pizza crust). It was very good, and enough to feed 2 people.
The other places I like are Pacific Wharf Cafe, and Taste Pilots. The Cove Bar by Ariel's Grotto serves great appetizers. This is the only park that serves alcohol.
In DL our favorite places to eat are these.
Sit down at Cafe Orleans for their Pomme Freites,(garlic, parmesan fries) Monte Cristos and Mickey Beignets. If you get the Monte Cristo, which DL is famous for, split it. It is super rich and quite heavy. In New Orleans Square.
Sit down at Carnation for the Potato Soup!!!! Yumm! On Main Street.
Fast food at Bengal BBQ for Bacon Wrapped Asparugus in Adentureland across from Indy Jones. Corn Dogs at the Red Wagon on Main Street. Pasta and salad at the Pizza Port in Tomorrowland.
Goodies- Applepie caramel apple on Mainstreet and Pooh's corner. Matterhorn macaroon at the Blue Ribbon Bakery, and of course a Dole Whip at the Tiki Room.
Now that I have given you all my favorite food spots, lets move on.
DL packs alot into every nook and cranny it can. You will be surprised how close everything is. Almost right on top of each other. In my opinion, it makes it very intimate and charming.
Most WDW vets are dissapointed in Sleeping Beauty's castle. It is not DL's big focal point. The Matterhorn is what most people view as DL's. So be prepared.

Even my own DD made a comment about how small the castle is compared to the MK's.
I think you will be pleasantly surprised with Fantasyland and Toonown at DL. The architecture is more detailed, and there are more rides compared to the MK also. I think the MK has DL beat in Tomorrowland as far as looks go. But Space at DL is WAY better, since it was redone. Be sure to check it out. Buzz is better too, cuz the guns are removable.
New Orleans Square is probably one of my favorite parts of DL. It has a nice atmosphere to it. Most people just love to hang around and people watch from there. Usually lots of live music too! Pirates, is located here. This ride is better here too.
To see Fantasmic, you need to sit and save a spot for it in front of the Rivers of America. Most WDW vets complain about this, and maybe rightly so. But it is a great show, and is different than WDWs. If you have time see it.
The fireworks are great. Used to be the best, but I'm afraid that they are cutting them down, and eventually getting rid of them. I am more dissapointed in this than anything else. The "Remember Dreams Come True" fireworks were always my highight of going to DL. If you love Disney, than this show will absolutely give you the chills, and maybe even make you teary. They have cut out the part about Big Thunder Mountain, but hopefully you will still enjoy it, and would not even know the difference if it hadn't been mentioned. Can you tell I am not happy about this?

Oh and the first night you are there, plan on seeing them. The reason being, is that if you wait until your last night, they could be cancelled due to high winds. This happens alot.
I could go on with the rides, but I know I have already been long winded.
Keep asking away and good luck!!
PS-It truly is easier to navigate than WDW!!