Treasure Island is the southern most city beach that is guarded by the City of Laguna Beach, Department of Marine Safety; located just north of Aliso Creek Beach. It is best accessed by the ramp at the southwest corner of the Montage Resort.

Popular activities include swimming, skin and scuba diving, tide pooling, and other beach activities. The beach has a good amount of sand, but can get crowded during weekend or hot summer days.

This beach is mostly sand bottom with shorebreak type surf. The beach can become steep at times depending on the sand. The surf can become large with numerous rip currents forming at the north end along the rocks and at the southern end as well. Skimming is allowed at the southern end of the beach.

If you do visit this area please do not take, collect or disturb any of the marine life. The taking or collecting of rocks, shells, or marine life is prohibited. Fishing is no allowed at this beach.