After our three days of summer heat, Labor Day feels abrupt, but hopefully we’ll see some nice September weather. Let’s tidy up some of these summer loose ends: Woodminster Theatre paints your wagon in its last summer performance. Bring the kids for classic musical set in California’s gold rush days. Really get into some math and catch the Exploratorium’s Geometry Playground before it goes national. Check out the physics of gravity at the  Giro di San Francisco and watch the cyclists take the hills. “Let It Drip” at Family Sundays at SFMOMA where kids can see some art, and make some art. The Monterey Bay Regatta in Santa Cruz sails into harbor with plenty of big boats for little eyes. Find your own way to say “Hello, Fall!” this weekend.

Ride the Rails The Historic Rail Fair takes place this weekend at Ardenwood Historic Farm, that hot spot for all things old-timey. The Railway Fair doesn’t disappoint with period costumes and rides on steam trains from the 1890s. Look out for food and special hobo games for kids. Bring your engineer caps and take in these days gone by. All aboard! Sat. – Mon., 10:00 a.m. – 4:00 p.m., Fremont, $8/adult, $5/children (4 – 17), 3 and under free. Read more.

Rainbow Brite Break out your rainbows for a second go-around–this weekend Oakland does Pride with tons of live music, food, and a special family and kid fun zone. Don’t miss this celebration of community and diversity. Sun., 12:00 – 6:00 p.m., Oakland, free. Read more.

Hill-Spotting Take a good look at Bernal Hill with Tree Frog Treks. Pick some berries and spot some birds on their rambling hike through some of SF’s best urban nature. Sat., 9:00 – 11:00 a.m., San Francisco, $25/family. Read more.

A Home Run The  Field of Dreams benefit for Juma Ventures will bring out the Giant in you. Providing college prep and employment assistance services for underserved youth, Juma Ventures has won awards for its innovation and effectiveness. At their Field of Dreams benefit, you can take a turn at bat or on the mound, hang out in the dugout, and take pictures with Lou the Seal. Get a giant helping of baseball while giving giant help to someone who needs it. Mon., 11:00 a.m. – 4:00 p.m., San Francisco, $500/family, $75/children 3 – 17 (portions of ticket fees are tax deductible). Read more.

Festivate! The Sausalito Art Festival is less about art and more about festival with a musical lineup that will have you melting. Check out the Children’s Stage for sets from local musicians, circus performers, and magicians. The Children’s Area hosts lots of kid-friendly activities so come and grab some eats, and if you’re not too busy walking like an Egyptian, take a look at some art, too. Sat. – Mon., 10:00 a.m. – 6:00 p.m. (5:00 p.m. Mon.), Sausalito, $20/adult, $5/children (6 – 12), 5 and under free.  Read more.

Sand in Your Hands Bring your buckets for the annual Sand Sculpture Contest on Drakes Beach at the Point Reyes National Seashore. Your mini-Michelangelo will love this opportunity to dig in the dirt and make some super sand art. Take a look at the other objets d’art before they return to the bay. Sun., 9:00 a.m. – 3:30 p.m., Point Reyes, free. Read more.

Flea Market and Families Willow Glen offers up some big fun this weekend with the Kids’ Flea Market and Family and Kids Day. At the flea market, the littles can haul out their treasures (or former treasures) and hawk them on the sidewalk for all the green their little hands can hold. You can start your day with Family and Kids Day activities in downtown. Look out for business specials just for families. It’s a great day to shop and swap up and down Lincoln Ave. Sun., Family Day 10:00 a.m. – 5:00 p.m., flea market 10:30 a.m. – 1:30 p.m., Willow Glen, free. Read more.

A Walk in the Garden Take a stroll on the Stanford campus and find out more about their outdoor art. The Cantor Arts Center hosts a monthly outdoor sculpture walk of the nearly 100 sculptures spanning the 20th Century. Bring a stroller and a hat, and maybe a ball in case your little critic needs a break from the art and some impromptu sport (The quads and fields on campus make for great play spaces.). Sun., 2:00 p.m., Stanford, free. Read more.

—Nicole Cooksey-Voytenko