Whether you're keen to relax in the sand or surf the waves, planning a beach vacation is a win for the entire family.  Here are some of our picks for family-friendly beach vacations on the East and West coasts of the United States.

Nantucket, Massachusetts:  This quaint island off the coast of Massachusetts is home to several kid-friendly beaches, including the appropriately-named Children’s Beach. Located on Nantucket harbor, Children’s Beach is great for toddlers and includes parks, a playground and picnic tables. If you visit between mid-July and August, kids can tie-dye their own t-shirts at noon each day.Nantucket is also famous for its festivals. 

Hilton Head, South Carolina: Adults and kids will find harmony in this South Carolina island getaway. Filled with golfing, shopping, tennis and of course, miles of beach, Hilton Head, South Carolina, is one of the top family beach destinations in the U.S. . Adventurous kids will enjoy Hilton Head's Indian Shell Ring at Sea Pines Forest Preserve, which was once used as a place to dispose of oyster, clam and mussel shells, along with bones of native animals. Animal lovers can observe deer, birds and fish in Hilton Head, too.  Keep your eyes peeled for dolphin sightings while you're enjoying the calm Hilton Head waters.

Vero Beach, Florida: The Disney people set up shop in Vero Beach -- only two hours from Orlando -- with their Disney Vacation Club Line. Parents Magazine lists Disney's Vero Beach Resort as one of their top family beach resorts in 2008. Although this isn't a Disney theme park, kids will find plenty to keep them busy. Entertainment ranges from lifeguard-attended swimming pools and beaches to miniature golf and soccer games. Be sure to attend the campfire sing-along that includes s'mores – a favorite for kids.

Vero Beach is perfect if you want to vacation in Florida on a budget. The Disney Vero Beach Resort features accommodations with a kitchenette and many of the children's activities are free.

Coronado Beach, California: Coronado City Beach in San Diego is the granddaddy of kids' beaches. No matter what you or the kids want to do, you'll find it here. Swim, surf, go fishing, play volleyball and catch a glimpse of migrating whales (in the early winter).

Kids will also love this beach for its tide pools and kite flying. Parents will love the small-town feel and cleanliness of the beach.

Newport Beach, California: The miles of yachts, beautiful homes and trendy beach-goers make Newport Beach a sight-seeing experience for any age. Don't be fooled, though, this beach is made for families. Relax on the three miles of sandy beach or hit the calm waves, but be cautious of the occasional undertow. Take a break from the sand and head to the Balboa Fun Zone, which is located on the Balboa Peninsula of Newport Beach. 

Poipu Beach, Hawaii:  It's the most popular beach on the South Shore of Kauai and offers visitors the chance to snorkel, swim and surf. Smaller kids will enjoy the “natural ocean wading pool.” Parents can feel a bit safer knowing that Poipu Beach Park is also deemed one of the safest beaches in Hawaii (thanks in part to the daily on-duty lifeguards).  While you're in Hawaii, don't miss the chance to see some of Hawaii's amazing aquatic life, including green sea turtles, dolphins and Hawaiian Monk Seals.