Miami Seaquarium hosts its 18th Halloween event "Monster Splash Daytime Splash & Nighttime Bash," featuring trick-or-treating at Sharky's Sweet Tooth Station; kiddie rides and bounce houses at the Little Monsters Play Area; the Monsters in the Mangrove Haunted Walk; Flipper's Dance Party and more. Noon-10 p.m. through Oct. 28 and 31st. Miami Seaquarium, 4400 Rickenbacker Causeway, Key Biscayne. Daytime Splash is $39.95 and $29.95 for children 3-9. Nighttime Bash is $24.95 after 5 p.m. for adults, and $19.95 plus tax for children 3-12 after 5 p.m. Details: (305) 361-5705 or www.miamiseaquarium.com.