[dcobbett]

I don't think you mentioned how many and what kind of kids (boys, girls), and what you all like to do? An option might be to set up a base somewhere on the Cape and split time between the Cape and day trips to the islands (MV and Nantucket). That would also allow you to think about 1 or 2 day trips to Boston (historic) and point north (southern Maine). That type of plan will also give you options if you get a few days of bad weather.