Depending on season you may see whales (october to april)
Mirissa Beach is close to the most Southern tip of Sri Lanka. (Other nice Beaches)
The shoreline of Mirissa beach slides into the ocean without any dangerous shelving.
Most of the beach is sandy and rock free.
The rocky parts are at both ends, so if you like snorkeling or surfing, you should go there.
Colourful sunrises and sunsets to be enjoyed very often.