The Genesee Valley Park Sports Complex (131 Elmwood Avenue) marks the changing of the seasons quite literally Friday, September 7, with the "Slip and Slide" event, taking place 7-11 p.m. Take a last lap in the park's Olympic-sized swimming pool, since the summer swim season ends at GVP Sunday, September 9. At the same time, strap on some skates and hit the ice rink one day prior to the official start of winter skating season. The evening also includes various games and door prizes. An admission charge of $4 for adults and $2 for kids 18 and under covers admission to both the pool and ice rink, locker use, and a free skate rental. For more information on Slip and Slide call 428-7888.

Speaking of skating, the GVP ice rink season officially starts on Saturday, September 8. Open skate for the season (through April) takes place for all ages Mondays-Fridays noon-1:15 p.m., Fridays 10:30 p.m.-midnight, and Sundays 2-3:15 p.m. Adult skate (18 and over) takes place Wednesdays 10:30-11:45 a.m. and Sundays 3:30-5 p.m. For other activities, including "Skate & Shoot" hockey practices or figure skating lessons, visit cityofrochester.gov or call 428-7889. A nominal fee applies to most ice rink events.

MUSEUMS & EXHIBITS

GeneseeCountryVillage and Museum Ongoing: "Sweet! Desserts in America".| Tuesday Walks, 2 p.m.| Tue-Fri through Sep: "Garden Gatherings," noon. "Meet the Potter," 1:30 p.m. "Gatherings," 2 p.m.| Nature Center: Sunday Walks, 2 p.m. 1410 Flint Hill Rd, Mumford. Tue-Fri 10 a.m.-4 p.m., Sat-Sun 10 a.m.-5 p.m. $3-$14. 538-6822, www.gcv.org

RochesterMuseum and Science Center 657 East Ave. Through Aug 31: Family Fridays 11 a.m.-4 p.m.| Starts September 1: "Our Body: The Universe Within" (additional admission charge $16-$20) | Through Sep 9: "Genome: The Secret of How Life Works." | Live Science! Demonstrations, Saturdays 2, 3 & 4 p.m., Sundays 2 & 3 p.m.| Murray's Mobile Lab, Saturdays & Sundays, 1:30, 2:30 & 3:30 p.m.| Science Saturdays, 11 .am.-4 p.m.| Telescope viewings, Saturdays, dark-10:30 p.m., Free. Call 271-4552 ext 411 after 7:30 p.m. to confirm.| Ongoing Exhibits: "How Things Work" | "K'NEX" | "Expedition Earth: Glaciers and Giants" | "Rochester's Frederick Douglass" | "AdventureZone" | Carlson Inquiry Room | "At the Western Door" | "Try Science Around the World" | Rochester Business Hall of Fame | Erie Canal Lock Interactive Model | Raceways | "Turbulent Landscapes" | Rochester's 1873 Time Capsule. Mon-Sat 9 a.m.-5 p.m., Sun noon-5 p.m. $6-$8. 271-1880, www.rmsc.org

Strasenburgh Planetarium 657 East Ave. Starts September 1: "The Human Body" | Also showing big-screen films: "Beavers," "Rocket Space Earth"; star shows: "I See the Sky," "Navigating the Summer Sky"; laser shows: "Pink Floyd Laser." $7-$9. 271-1880; rmsc.org.

Strong - NationalMuseum of Play 1 Manhattan Square. Through Aug 31: End of day participatory parade.| Through Sep 3: "Cyberchase-The Chase Is On!" | Through Dec 31: "Child's Play." | Ongoing: Mondays: Toddler Book Club, 10:30 am, 11:30 a.m., 12:30 p.m. | "U.S. of Play," "Reading Adventureland," "Field of Play," Dancing Wings Butterfly Garden. Hours through Sep 3: Mon-Thu 10 a.m.-6 p.m., Fri 10 a.m.-8 p.m., Sat 10 a.m.-6 p.m., Sun noon-6 p.m. $9, $8 seniors and students; $7 children. $3 butterfly garden. 263-2700, www.museumofplay.org

Seneca Park Zoo 2222 St Paul St. Daily 10 a.m.-5 p.m. $8, $7 seniors, $5 ages 3-11, under 2 free. 467-WILD, www.senecaparkzoo.org.

BOOKS & STORYTIMES

Barnes & Noble Greece 330 Greece Ridge Center Dr. Wednesdays: Early Birds Storytime with Mike, 9:30 a.m.; Storytime and Craft, 10:30 a.m. | Third Thursdays: American Girl Club, 7 p.m.| Fridays: Storytelling with Mike, 10:30 a.m. 227-4020, www.bn.com

Barnes & Noble Pittsford Mondays: Great Starts w/Ann-Marie, through age 2.| Wednesdays: Storytime and Crafts w/Ann-Marie, 9:30 & 11 a.m. 3349 Monroe Ave. 586-6020, www.bn.com

Barnes & Noble Webster 1070 Ridge Rd, Webster. Thursdays: Wee Ones Storytime for under age 3, 9:30 a.m.; Storytime and Craft, 10:30 a.m.| Third Thursdays: Harry Potter Book Group, 7 p.m. 872-9735, www.bn.com

Borders Books 30 Square Dr, Victor. Wednesdays: Kids Storytime, 11 a.m. 421-9230

East Rochester Public Library 111 W Elm St, E Roch. Fridays: Storytime, 2 p.m. 586-8302.

Pittsford Community Library Mondays: Toddler Storytime, 10:15 a.m.| Thursdays: Preschool Storytime, 10:15 a.m.| Fourth Friday Films, 4 p.m. 24 State St, Pittsford. 248-6275

Wood Library 134 N Main St, Canandaigua. Third Mondays: Pizza & Pages, 6 p.m. Second Thursdays: Teen Night, 7 p.m. Third Thursdays: Anime Club, 6 p.m. 394-1318, www.thewoodlibraryteenscene.blogspot.com

RECREATION

Dentzel Carousel Tue 6-9 p.m., Wed-Sun Noon-9 p.m. $1. Ontario Beach Park, 4650 Lake Ave. 753-5887.

Family Yoga Adventures Tuesdays 6-6:50 p.m., Wednesdays 6:15-7:05 p.m., Thursdays 6:15-7:05 p.m. Ages 3 and up, $15. 1835 N Union St, Spencerport. 576-3870.

Helmer Nature Center 154 Pinegrove Ave. Mon-Fri 8 a.m.-4 p.m. 336-3035, www.westirondequoit.org/helmer.htm

Inside Track Speedway 775 Elmgrove Rd. Indoor go-karts. Wed-Thu 5-10 p.m., Fri 5-11 p.m., Sat 10 a.m.-11 p.m., Sun noon-8 p.m., $4-$6. 247-7333

LetchworthState Park Family Programs 1 Letchworth State Park, Castile. Through Aug. Mon 10 a.m., 2 & 7:30 p.m.| Tues 10 a.m., 1, 2 & 7 p.m.| Wed-Fri 10 a.m., 1 & 2 p.m.| Sat 10 a.m., 1, 2, 3:30 & 7 p.m.| Sun 10 a.m., 1, 2, 3:30 p.m. Free w/admission. Call 493-3625 for locations.

Teen Open Basketball 85 Adams St. Mon, Tue, Wed & Fri 5:30-8:45 p.m. Sat 11 a.m.-6 p.m. Ages 14-18. 428-7266.