Mountain bike trails. Sunrise-Sunset at Amelia Earhart Park, 401 E. 65th St., Hialeah. Every day. Free on weekdays. Details: (305) 401-8130 or (305) 685-8389.
Junior League of Miami hosts the third annual golf tournament, a charity event to benefit community projects. 7:45 a.m. at Crandon Park Golf Course, 6700 Crandon Blvd., Key Biscayne. $200-$750. Details: www.jlmiami.org.
Miami Lighthouse for the Blind and Visually Impaired presents White Cane Safety Day and Walk-a-Thon. 9:30 a.m. Meet at 601 SW 8th Ave., Miami. $5 donation. Details: (305) 856-2288 or www.miamilighthouse.org.
Heritage Horse Show. 8 a.m.-7 p.m. at Tropical Park Equestrian Center, 7900 SW 40th St., Miami. Free. Details: (305) 554-7334.
Fairchild Tropical Botanic Garden features a Bonsai Show. Through Sunday. 9:30 a.m.-4:30 p.m. at 10901 Old Cutler Dr., Coral Gables. Free members and children under 5; $10-$20 others. Details: (305) 389-3243.
Arch Creek Nature Walk. 10-11:30 a.m. Meet at Arch Creek Park Museum, 1855 NE 135th St., North Miami. $3. Details: (305) 948-2891.
Historical Museum of Southern Florida presents tours of Little Havana, Little Haiti and Lemon City with Paul George. 10 a.m.-1 p.m. RSVP required. $34-$39. Details: (305) 375-1621.
View and learn about the night sky with the Southern Astronomical Society. 8-11 p.m. at Bill Sadowski Park and Nature Center, 17555 SW 79th Ave., Miami. Free. Details: (305) 661-1375.
See various creatures and plants at Crandon Bear Cut Preserve Nature Walks. Various times at 6767 Crandon Blvd., Key Biscayne. Through Sunday. RSVP required. $1-$2. Details: (305) 361-6767.
Matheson Hammock Eco-History Walk with Frank Schena.10 a.m.-12:30 p.m. Meet at 9610 Old Cutler Rd., Miami. $17-$22. Details: (305) 375-1621.
Susan G. Komen Breast Cancer Foundation Race for the Cure. 6 a.m. at 301 N. Biscayne Blvd., Miami. Proceeds benefit Susan G. Komen Breast Cancer Foundation. Details: (305) 666-7223 or www.footworksmiami.com.