Best area and/or accomodations for young family going to Cape in July 2011

Tis will be the first trip to Cape cod.
I am traveling with my wife and 2 year old daughter.
We would love to be on the beach or at least close to a kid friendly beach.
We are looking for a hotel with a pool or other accommodations with such.
We would probably stay 3-4 nights.
Any recommendations as to which areas to stay? (Dennis, yarmouth? etc)
Any recommendations on accommodations?

Thanks

Mark