Well, I consider myself a DL veteran as I have gone every year since I can remember (except last year went to WDW twice). Here is my advice, I'm sure you'll get lots of it, you can "weed out" what you think is helpful to you. Here goes.
1) There is a full service spa @ the Grand Californian. Really great!
2) Accomodations. This is where I have the strongest view. Do NOT stay off
Disney property. I have stayed off site 4 times (most of those times in
the 90's) and the experience was NOTHING like staying @ a Disney hotel.
3) For a "single" guy you could find nice/price friendly accomodations at the
Paradise Pier. It is perfect for you for 1 night. They have nice dining and
is right across the street from the Grand Californian.
4) If you're dead set staying off property, I would only recommend the Best
Western Park Place Inn. VERY close to maingate and decent (as compared
to the other "less than desirable" rooms on Harbor.
5) If you stay onsite they do have an early entry, but it is usually only for
1 or 2 different lands. Almost always Fantasyland, sometimes
Tomorrowland.
6) Great dining options @ DTD. Lots of great choices priced reasonably.
7) As far as parks...that's a toughie. I LOVE DL & DCA but if I only had 1 day
I would probably spend 80% of it @ DL and 20% @ DCA.
Since you've never been to DL, you're in for a REAL treat! It is SO much
better than MK IMHO, you will want to take as much in as you can.
Definitely do things they don't have @ MK....Matterhorn, Alice in Wndrland
Casey Jr, Storybook Whale, POTC (WAY better than MK) the original
(and best) Haunted Mansion.
8) Must do's @ DCA...California Screamin', Ferris Wheel, Monster's Inc.,
Grizzly River Run. You can probably fit all these rides in in about 4 hrs
or so if you really move.
That's my advice, take what you think applies and discard what you don't. I can honestly say that staying onsite @ DL is supremely important and taking in all of the Original
Disneyland park will make the best use and enjoyment of your time.
Have a great trip!!!