I dont know if I would recommend Huntington for your group. It is a VERY wide beach meaning that it can be quite a hike from the parking lot to the water. Its great if you like lots of sand, but if your parents are older that might be harder for them and with pre-schoolers it might be a pain, but it is the closest to DLR. It depends on what is more important to you distance or appropriateness of park for your group. If youre willing to go a little further I would actually recommend with your little ones Corona Del Mar (its where I always went when my children were young). It is a small beach with close parking and even a playground. The waves are small and the sand is nice. Its officially part of Newport Beach (south end) but you have to get to it separately and it is separated from the rest of Newport by water into the bay. Get there by going down I5 south to 55 south, take 73 south (this is a toll, but you will get off before a toll booth), exit McArthur Blvd, take that to Marguerite Ave (at PCH intersection), turn right. Follow that to the end at Ocean Blvd. Turn right on Ocean, the stay to left to go down hill on Iris Ave to the parking lot. If you want to avoid freeways take Harbor Blvd south all the way to Baker St. Turn left and continue to Bristol, turn right until Jamboree and turn right until PCH (1) turn left the go the Marguerite as in previous directions. It will likely take you at least 45 minutes by avoiding the freeways. Good luck with your decision.