Spend Valentine’s Day doing something good for your heart and your community. The Myrtle Beach Marathon benefits organizations like the Leukemia and Lymphoma Society of South Carolina, our local chapter of the American Red Cross and Horry County Schools. Now in its 18th year, this Boston marathon qualifying race is a fast, flat ocean course. Several events and shorter races are also part of the marathon weekend. Various Grand Strand locations. Thursday–Saturday. Visit website for events, prices and times. (843) 293-RACE, www.mbmarathon.com