Learn about marine plants and animals at low tide with Seattle Aquarium naturalists, who will provide information on sea life and discuss how to enjoy the beach without harming it. Drop-in events are on several days through July 23, starting this weekend, one of the lowest tides of the year: 10 a.m.-2 p.m. Saturday; 10:30 a.m.-2:30 p.m. Sunday; 11 a.m.-3 p.m. Monday; 11:30 a.m.-3 p.m. Tuesday, Carkeek Park, Golden Gardens, Constellation Park/South Alki, Lincoln Park, Seattle; Seahurst Park, Burien; Richmond Beach, Shoreline; and Des Moines Beach Park, Des Moines;
and 10 a.m.-2 p.m. Saturday, 10:30 a.m.-2:30 p.m. Sunday; 11 a.m.-3 p.m. Monday, Olympic Sculpture Park, Seattle; and Redondo Beach, Des Moines; free (www.seattleaquarium.org/beach-naturalist
Colman Pool: Opening season of the weekend of outdoor, saltwater, Olympic-size pool with giant tube slide, Saturday-Monday, Lincoln Park, 8603 Fauntleroy Way S.W., Seattle; $3.75-$6.50, slide additional $1 (206-684-7494 or www.seattle.gov/parks/aquatics/colman.htm).
Getting There by Bike: How to use bikes to get around in the city, for individuals and families, noon Saturday, NewHolly Library, 7058 32nd Ave. S., Suite 104, Seattle; free, no registration required (206-386-1905 or www.spl.org/about-the-library/library-news-releases/sound-cycling-423).
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Hydro Fever: Free admission to a gallery display of vintage hydroplanes and memorabilia, model-hydro racing for kids, 10 a.m.-4 p.m. Saturday; auction of hydro memorabilia to benefit the museum, noon, Hydroplane and Raceboat Museum, 5917 S. 196th St., Kent (thunderboats.ning.com/
Cascade Warbirds Fly-In: Fly-in and display of vintage-military aircraft from several nations from World War II through the Vietnam conflict, 9 a.m.-3 p.m. Saturday, East Parking Lot, Museum of Flight, 9404 E. Marginal Way S., Seattle; free (206-764-5720 or www.museumofflight.org).
Kite Day, Vashon: Fly your kite on the beach, tours of lighthouse, music, food and kites for purchase, 10 a.m.-2 p.m. Saturday, Point Robinson Lighthouse, Southwest Point Robinson Road, Vashon Island; free (206-463-6672 or vashonparkdistrict.org).
Kitsap Harbor Festival: Food and craft vendors, entertainment, murder mystery, beer garden, KidZone activities, 10 a.m.-6 p.m. Saturday, 10 a.m.-5 p.m. Sunday, Bremerton Boardwalk and Port Orchard Waterfront Park; Kitsap Car Cruz 10 a.m.-4 p.m. Saturday, Bremerton; Seagull Calling Contest, Sunday, Port Orchard Waterfront Park (www.kitsapharborfestival.org).
Madeline McKenzie: firstname.lastname@example.org