OUTDOORS Events This Week NATIONAL PUBLIC LANDS DAY. Saguaro National Park. Lend a hand on the largest, one-day volunteer restoration event held for public lands each year to clear out non-native plants to reduce wild fire risks on Saturday, September 28 from 7 to 10 a.m. Advance registration is encouraged. Call the Saguaro National Park visitor center at 733-5153 (east) or 733-5158 (west). TOHONO CHUL PARK TOURS. Tohono Chul Park. 7366 N. Paseo del Norte. 742-6455. Walk in the Park tours, overviews of the park's 48 acres and its flora and fauna, are offered at 9 a.m. Tuesdays, Thursdays and Saturdays, and at 1 p.m. Sundays. Art in the Park tours, docent-guided looks at gallery exhibits, are at 9 a.m. Tuesday and Thursdays and 2 p.m. Saturdays. Birds of Tohono Chul provides opportunities to observe the many species frequenting the park, and meets at 8 a.m. Mondays, Wednesdays, Fridays and Saturdays. Grounds are open from 7 a.m. to sunset daily. Exhibit hours are 9:30 a.m. to 5 p.m. Mondays through Saturdays, 11 a.m. to 5 p.m. Sundays. Greenhouse hours are 10 a.m. to 4 p.m. daily. Admission is $2. Call 742-6455 for a daily event schedule.