1. Science Saturday: Families can enjoy weekly marine science-themed activities at the Tampa Bay Watch Discovery Center at the St. Pete Pier. This week’s theme, “Groovy Geology,” explores prehistoric life and Earth’s geological features. Best for kids in grades 2-5. Includes admission to the center and 45 minutes of gallery time. $8, $6 children. 11 a.m.-1 p.m. Saturday. 700 Second Ave. N, St. Petersburg. 727-867-8166. tbwdiscoverycenter.org.
2. Shine Mural Festival: The annual festival that invites mural artists to paint on walls across St. Petersburg this year will feature all Florida-based artists and be ocean themed. The artists have a week to finish their murals starting Wednesday. Artists include: Alex Yanes, Miami; Ales “Bask” Hostomsky, St. Petersburg; Elle Leblanc, St. Petersburg; Lily Yuan, Jacksonville; and Nneka Jones and Bianca Burrows, Tampa. There will also be some community murals, including one by the Glazer Vision Foundation, which will provide an eye exam and a free pair of glasses to children in need every time someone shares a picture of the sculpture of giant glasses with the hashtag #oneshareonepair. glazervisionfoundation.org/one-share-one-pair. Find a virtual tour of the city’s murals at the St. Petersburg Arts Alliance site at stpeteartsalliance.com, where you can download a free app with a map of the murals.
3. Free Family-Friendly Scavenger Hunt: This Halloween-themed scavenger hunt is $10 but is free with the promo code “spooky” at localscavengerhunts.com. If the hunt inspires you, the company has created a number of city-specific missions for Clearwater Beach, Orlando, downtown St. Petersburg and more. City hunts run $40 per team. The Halloween-themed scavenger hunt can be done anytime, anywhere and can be completed in about two hours. (352) 631-0614.
4. Fall Train Swap: Model train enthusiasts will gather in the parking lot of Zitnik Trains to swap collectibles. Trains will also be on display. Masks required. Free. 9 a.m.-1 p.m. Sunday. 5193 73rd Ave. N, Pinellas Park. (727) 201-9668.
5. Rec Days: Three times a month, Sarasota’s Nathan Benderson Park allows people to try standup paddleboarding, kayaking, canoes, fishing and a 15-foot sailboat (with captain). Rec Days are free for ages 6 and younger, $10 per person, $5 per adult with accompanying child. The family maximum is $35 (for households of five or more.) While you’re there, check out the hay maze set up in the park. It’s free to explore and will be in place through Thanksgiving. Fishing licenses are required for all participants 14 and older who choose to fish. Upcoming Rec Days are 10 a.m.-2 p.m. this Saturday, as well as Nov. 11 and 21, and Dec. 5, 9 and 19. Find more information and required waiver forms at nathanbendersonpark.org/recdays. The park is at 5851 Nathan Benderson Circle in Sarasota.