La Jolla Cove, San Diego, California

• Located in San Diego, California, the La Jolla coastline stretches seven miles long from the Scripps Pier all the way to Bird Rock. The main beach, known as La Jolla shores, is a great surfing and family beach. At the sound end of the beach, the terrain becomes rocky sandstone cliffs, wrapping into La Jolla Cove. Among the cliffs there are seven caves, each of which are accessible by kayak. Only one cave -- the Sunny Jim cave -- is accessible from the beach. At extreme low tides, you can enter the Sunny Jim Cave by foot, which is equipped with man-made steps that lead to a land exit. You will be charged a $4 entrance fee to the cave ($3 for children under 16 years old), as of January 2011.
  
  

Leo Carrillo State Beach, California

• Stretching one and a half miles long, the beach at Leo Carrillo State Park is excellent for surfing, fishing, exploring the caves and even camping. Leo Carrillo beach is located about 30 miles north of Santa Monica and is equipped with Wi-Fi service and coin-operated hot showers. If you want to explore beyond the beach caves, there are several hiking trails.
  
  

Honokalani Black Sand Beach, Maui, Hawaii

• Located in the Wainapanapa State Park on the island of Maui, Hawaii, Honokalani is a rare black sand beach. Surrounded by lava cliffs on both sides of the beach, what appears to be sand is actually tiny pieces of lava that have been smoothed out by the sea. Sea caves are located within the lava cliffs and are only accessible at low tide. Be careful during the winter months, as the waves are large and powerful. Keep in mind that there are no lifeguards on duty at Honokalani Beach.
  
  

Sand Beach, Mount Desert Island, Maine

• Mount Desert Island is a small island off of Maine, home to the Acadia National Park. Sand Beach is located on the eastern end of the island, off of the Schooner Head Trail. The beach is remote and at low tide allows access to Anemone Cave. You will have to walk over wet, slippery road to reach the cave. At high tide, the cave is not accessible. The best time to go inside the cave is at a dropping low tide, as you will find heaps of urchins, sea anemones, crab, snails and other sea life.