Big Lagoon is formed by a long sand spit that separates it from the Pacific Ocean. The spit is actually a continuation of Agate Beach, and a premier beachcombing location. Here the determined walker can find a profound solitude amid the elements, not to mention agates, jade, jasper, chalcedony and other wave-tumbled stones.
Big Lagoon County Park is located at the south end of Big Lagoon. It offers 25 campsites, picnic tables, fire rings and flush toilets. Several of the campsites are right on the lagoon, offering increased privacy and great views. Camping is first come, first served, and dogs are permitted for a small extra fee. Firewood is usually available to be purchased from the camp host, and campers are permitted to gather driftwood to burn. For the daytime visitor there is a nominal day use fee.
Big Lagoon is popular with kayakers and wind-surfers, and is a favorite fishing spot for cutthroat trout. The shore is easily accessible for small boat launching.