If you are more of a land crab instead, the beach of course also offers many activities for you. If you are the active type, it could be a game of beach volleyball or beach tennis. Maybe you brought a frisbee or football with you, with which you can spend hours playing at the stand.
Another fun activity can be hunting for shells, rocks and other treasures along the water's edge, where exciting things always wash up. If you are lucky, you may also find amber, which also often washes up along with seaweed and rocks. It can be difficult to distinguish amber from the other stones, as it can be both white and brown, but you can always try to bite into it. If it is soft, or at least softer than a stone, then it is probably amber you have got hold of.
If you want to be absolutely sure of finding amber, you can go on an amber safari, where there is always a guarantee of finding amber. It is a guided tour where you learn where, when and how to find amber.