Okay here are my tips -
IF you can fly into the John Wayne Airport in Santa Ana (SNA) it is WAY closer than LAX and so much easier to deal with too!
Go to the DL website and look and the hotels - there are 3 "on property" but unlike WDW the off property ones on Harbor Blvd across the street are walking distance.
I love the Grand Californian Resort but it is the most expensive so most folks stay at the DL Hotel - it is the original hotel built for the park by Disney. There is also the Paradise Pier and it tends to be less expensive than the DL Hotel. Both the Grand CA and DL Hotel have very nice pools. If you are staying at PP (it too has a pool just not a big themed one) you can also walk across the street to use the "Neveland Pool" and the DL Hotel. The last time I stayed there only guests of Grand CA can use their pool - but can also use the other resorts pools - although I dont know why you would want to. I love the Grand CA it is "kinda" like the Wilderness Lodge at WDW - not the surrounding theming or landscape but the building itself is a beautiful "Arts & Crafts" deisgn period lodge. It has a warm and welcoming feeling and quite special. The rooms and not huge though!
Also consider the Paradise Pier -if you can get a resort view room there it maybe less expensive than the DL non resort view room and an option to consider. I like the Paradise Pier myself esp when I can get a much cheaper rate than DL Hotel. But for someone who has never been there and wanting to experience "Disney Magic" then I think you would be pleased with the DL Hotel. Hope that wasn't too confusing!
The monorail goes to Downtown Disney which is near the DL Hotel and PP hotel. It only stops at DTD and Tomorrowland inside the park. Unlike WDW the monorail does not actually go directly to the hotels.
The GC Hotel has a private entrance into Disney's CA Adventure which is nice and the PP does too, but you have to walk across the street to it.
As far as discount codes I don't think DLR uses these but others here may know more - we usually request a
AAA rate or you can check the rate they quote against Expedia offerings just to see what's the best deal.
Well have fun planning your trip! I am sure you will love
Disneyland it is Very Magical!