- I use
Wikimapia. Hover over all of the parcels on Harbor Blvd (the street directly east of the Resort) and it will give you the name of every hotel nearby. It also has a distance so you can measure how long the walk would be. I think the Residence Inn right by the I-5 is walking distance, though.
- Three days would probably be enough, but if you have the time, I would get four. The pricing is similar to WDW's in that the fourth day won't be as expensive and there really is almost as much to see at DL as at WDW. You may not need the fourth day, but I doubt you would regret it. Personally, I spend 7-10 days on my trips to WDW and go to each park multiple times. If you go to WDW for four days and do everything once and only once, maybe you should lean more towards three days.
- The crowds in early October aren't too bad. Just keep in mind that the crowd patterns are different: the parks get busier on weekends and in the evenings when the 20 million people that live nearby are off of work. Touringplans says anywhere from a 1-5 during the week and 5-8 on the weekends. If you did your trip Monday-Thursday, I think that would be ideal. Watch out for Columbus Day, too.
- If you're mostly going to Disneyland, SNA is much closer.
- I'm going in November, and I made a
Google map of everything I'm trying to do. I also have a
thread going on the boards here. I think October is a good time for whale/dolphin watching, and the Reagan Library has a big Disney Archives exhibit. The Reagan Library is really cool, anyway: big piece of the Berlin Wall, walk inside the real Air Force One from the 70's to 2000ish, see Marine One and the Presidential limo...