The ‘Aiea Loop Trail is 4.8-mile trail that begins and ends in the park. This trail runs along the ridge on the west side of Hälawa Valley and offers views from Pearl Harbor (Pu‘uloa) and the Wai‘anae Range to Honolulu and Diamond Head (Lë‘ahi). Stands of Norfolk Island pine trees mark the lower end of the trail. Look for the native koa and ‘öhi‘a trees as you reach Pu‘u Uau, the high point about midway along the length of the trail. You might also see remnants of a B-24 bomber that crashed in 1944. This hike is not strenuous but involves some gradual uphill climbs with a steep switchback and stream crossing at the end of the trail. The trail may be muddy with sections of exposed tree roots. Give yourself about 2.5 to 3 hours for the hike and enjoy the plants and the sound of birds around you. Bring water and wear good walking shoes. Be prepared for light passing rain showers. Stay on the designated trail and avoid side trails and short-cuts. The park includes the remnants of Keaiwa Heiau a medicinal/healing heiau.