Our older kids loved the boogie-boarding (oops, my husband always corrects me, it's body boarding). The water was frigid, absolutely, but they didn't seem to mind. Luckily, it was warm - the weather was amazing.
As we drove home, my husband seemed completely worn out and kept recommending we bring a nanny with us the next time we visit. Vacations with four young children are definitely a lot of work, especially for the Dad, at least in our family.
It was really a lot of fun.