How old are your kids. There are a lot of destinations with many activities to keep families busy for a one week period. If Hawaii is too far there are also several Carribbean/Southern options that exist.

Aruba
Cancun
Costa Rica

At any of the above there would be plenty of activities available to keep most kids of all ages busy. Not to mention beaches, pools and the resorts themselves.

We head to Cancun for two weeks every summer. This year my kids are 3 and 6. We will not be bored as there is plenty to do as well as a nice pool and great beach. Sure I get to build lots of Sandcastles on the beach, however, this is their vacation for me being away off and on during the year!!