There is a very nice Marriott just outside the airport on Century Blvd. Easy trip by cab.

Are you renting a car for your stay? Are you sure that you want to take 2 kids, 4-2 to Disneyland? Legoland in Carlesbad (San Diego, CA area) might be better for them and probably not as expensive. It also includes a waterpark. The world famous zoo and SeaWorld are both in the area. Just some thoughts.

Does the Hilton deal require a timeshare tour? Just asking. I'm not saying that there is anything wrong with that. Hilton has some very nice properties.

Check www.hotwire.com for possible car rentals. It's a third pary site but I've gotten deals from them as low as $13.99/day plus tax and airport fees (totaled about $18.00/day but that's still half of what you are looking at from Fox). You won't know the vendor until you book it but twice the vendor was Enterprise and another time it was Hertz. Both better, IMO, than Fox. One of the rentals was a four door sedan that easily seated 4 and only had 11 miles on it when it was delivered to me (even though I was traveling by myself).

In Southern California most hotels do charge for parking because if they don't 'freeloaders' will take up valuable real estate. It's just the market. Sometimes, depending on where you are, there is reasonable street parking but, when I'm traveling, I like to know where my car is each night, even if it belongs to someone else.

If you go to Disneyland for a couple of days you might skip the initial car rental and take a shuttle to Anaheim (although it probably won't save you a lot of money from LAX). If you decide to spend a couple of days there, grab a hotel that's 'walkable' to the park or take the ART Shuttle (Anaheim Rapid Transit) back and forth.

If you are willing to use some of your Marriott 'Chit' there is a newer Residence Inn near Disneyland. It does't have a lounge but they serve a free breakfast everyday, and a 'Manager's hosted dinner' several times a week. Also has a full kitchen so if you want to store some snacks/beverages (kids want to eat when they want to eat) that's handy. There are plenty of places around there to pick up 'groceries'.

You didn't say what dates you will be visiting and that would be helpful to know in terms of recommendations since weather, conventions and other events may be going on.

http://www.sandiego.org/nav/Visitors
http://california.legoland.com/