Because it is a resort area which attracts large crowds during the summer, occasional petty crime can be an issue for tourists who are more often than not the targets of such acts.  To make sure you do not become a victim of a pick pocket or car thief you should take care to keep valuables and large amounts of cash in your hotel's safe rather than on your person.  Men should carry their wallets in their front pockets, and while at the beach try to make sure that there is always at least one person "guarding" belongings such as hotel keys and money while others are swimming.

Beach safety is also important.   The Rehoboth Beach Lifeguard Beach Patrol has a great website which offers visitors several helpful safety tips including daily information on rip currents and jelly fish.  See thier site for more details.