Ok, I’ll be a voice of dissent here. For our family, 4 seems to be the sweet spot. Sometimes I think there must be a reason the most days they sell together is a 5 day ticket—other than the fact that people were selling unused days on longer tickets.
Seven days in California is perfect, though. You could spend 1 day going to Griffith Park. See the original carosel, hike to the Hollywood Sign and just enjoy some green. See the observatory and Walt’s barn. Go to the beach. It’s and hour and a half drive to San Diego. Go to the zoo there or the wild animal park. Mix things up. Because of the small ticket price difference, get a 5 day. Plan the first three days in a row and then plan California time for the next two days. That leaves you with two days where you can split time or go back to DL and enjoy your highlights. There are times we have just hit the park for the first 2-4 hours and did everything we wanted to do.
Now, on our longer trips, we try to mix things up. I try to have a “game day” where we have an old Gumball rally packet or a MouseAdventure that I get from Third Gate Games. That is a fun way to all play together without feeling like we are just going on the same rides over and over. We have done all the tours. Many years ago, I would have recommended the Family Magic your for you. Now it’s been stripped down so much that I would pass. You might enjoy the Walk in Walt’s Footsteps and if the kids are real Disney nerds, they might like that too. That being said, I’ve always felt that one was geared more towards adults.
Anyway, you will have fun. Welcome to the completely packed—with both crowds and rides/attractions—Disneyland.