Trinity Services, Inc. - Centers for Dual Diagnosis - The Oak Center offers individual and group therapy, adult day treatment, outpatient therapy, and family support services. The services are available to individuals who have been dually diagnosed with both a mental illness and an intellectual/developmental disability. Additional activities include softball, sand volleyball, basketball, and disc golf. The site also offers walking trails and a fishing pond, which encourage participants to explore healthy activities while developing independence, self-esteem and improved psychological functioning.