We are going to be going to So-Cal for a week in February and my wife was looking at Hotel rates in the San Diego-Carlsbad area. She was finding problems booking adjoining rooms (An ungoing fricking hassle with hotel chains) and the rates were running steep.
So we fell back on an old friend, Vacation Rentals By Owner or VRBO for short. It was where I found my cabin in Washington state for my get away. She looked and was finding rental homes with swimming pools AND private beaches for right around a thousand a week.
That sounds a little steep on the surface but a NICE hotel will run near $200 a night for an occupancy of 2 growed ups and two kids, more with a suite or adjoining rooms. That's slightly cheaper for 7 full days in a private house with a full kitchen and private swimming pool. Most of the rentals have hot tubs and other bennies as well.
We have used this a lot for vacations and have had really good luck with the prices and been totally satisfied with the rentals.
If it can save any of you money on big family trips it pleases me to share the tip.
http://www.vrbo.com/