CANALAPALOOZA - COLUMBIA CANAL AND THE FALL LINE: 1-5 p.m. Sunday, Riverfront Park, 312 Laurel St. Use Laurel Street park entrance at Huger Street. An educational afternoon in the park. (803) 545-3100; columbiagreen.org
SUMTER NATIONAL FOREST CLEANUP DAY: 8 a.m.-noon Saturday, Tip Top Hunting Camp, U.S. 72 in Laurens County. Volunteers should be dressed for the weather; long sleeves, pants and sturdy shoes are recommended. Supplies, gloves and vests will be provided. Lunch will be served following the event. Volunteer: (877) 725-7733. palmettopride.org
NORTHWEST FAMILY YMCA'S PUMPKIN RUN 5K RUN AND WALK: Packet pick up/late registration, 7 a.m., one-mile kids' fun run, 8 a.m., 5K run/walk, 8:30 a.m., awards ceremony, 9:35 a.m. Friday, NorthWest Family YMCA, 1501 Kennerly Road, Irmo. Registration: $30; race day, $35. Register online. (803) 407-8007; strictlyrunning.com
GET YOUR GEAR ON - RIVER TRIPS: Lower Saluda, 11 a.m. Saturdays, $35 per person; Upper Saluda, 2 p.m. Sundays, $35 per person; Congaree River, 4 p.m. Saturdays, $30 per person; Three Rivers Extravaganza trips available upon request. $55 per person. Trips are approximately three hours long. (803) 799-0999
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BETWIXT THE RIVERS - LITTLE PEE DEE RIVER TOURS: Little Pee Dee River Paddle, 10 a.m. Saturday and Oct. 31, and 2 p.m. Sunday, Daily private tours available. $50-$65; (843) 423-1919
ADVENTURE CAROLINA: Classes: outdoor cooking class, 6 p.m. Oct. 28; basic kayaking class, 8 a.m. Saturday; white-water class, 8 a.m. Saturday; river trips: Congaree, 2 p.m. Saturday; after-work kayaking trips, 5:30 p.m. Thursdays; hikes: 10 a.m. Saturday and Oct. 31; Halloween trip to Graveyard Island, 2 p.m. Oct. 31; Adventure Carolina, 1107 State St., Cayce. (803) 796-4505; adventurecarolina.com
CONGAREE NATIONAL PARK: Tree Trek, 1:30 p.m. Sunday, Monday, Oct. 28 and 31; Nature Discovery Hike, 9:30 a.m. Oct. 31; Owl Prowl (reservations required), 8 p.m. Oct. 30; Guided Canoe Tour guided canoe tour (reservations required), 9 a.m. Sunday and Oct. 31; Floodplain Foray, 1:30 p.m. Oct. 30; Going Batty, 6 p.m. Oct. 30; Congaree Campfire Chronicles, 5:30 p.m. Friday and Saturday; 100 National Park Road, Hopkins. (803) 776-4396; nps.gov/cong