Beaches are about an hour away (including parking and surface street time). You could go to Santa Monica Pier with the kids, if you wanted. It has a big boardwalk games area and a couple rides. Kids would probably enjoy that a bit...but just playing in the sand is always a cheaper great time. 
Legoland is awesome for boys at your kids' ages. My friends in San Diego go there all the time and love it. Might be worth a one day trip to check it out. With 7 days at disneyland, you'd probably be fine taking one day off as a side trip. It takes about an hour to drive to legoland from Anaheim, maybe just a tad longer.
Don't forget to take advantage of rider switches as disneyland for the bigger rides that the little one can't make yet...that way both the parents can ride with the older kid at least once each. If you don't know about rider switches, ask the CMs at the ride entrance of Thunder, Space Mountain, etc. The big rides all have rider switch passes.
Also, as far as growing...thick socks, big thick sneakers (and possibly a little wad of napkins stuffed in the bottom of the shoes
) helped my daughter grow just enough to ride Indiana Jones when she was smaller.

Legoland is awesome for boys at your kids' ages. My friends in San Diego go there all the time and love it. Might be worth a one day trip to check it out. With 7 days at disneyland, you'd probably be fine taking one day off as a side trip. It takes about an hour to drive to legoland from Anaheim, maybe just a tad longer.
Don't forget to take advantage of rider switches as disneyland for the bigger rides that the little one can't make yet...that way both the parents can ride with the older kid at least once each. If you don't know about rider switches, ask the CMs at the ride entrance of Thunder, Space Mountain, etc. The big rides all have rider switch passes.
Also, as far as growing...thick socks, big thick sneakers (and possibly a little wad of napkins stuffed in the bottom of the shoes
