Grab some toy or dollar store plastic pins and balls or use plastic water bottles partially filled for stability. Throw a ball to knock them down and see who can get a strike or spare. Keep score or just play for fun.
No need to take a great deal of equipment for your fun day at the beach. However, with a little planning, you can pack your bag with a few inexpensive items such as card games (like Spider Solitaire), buckets, toys, and kites from the local discount store and be ready to play the day away. Enjoy!