Ready to make a splash? An Under the Sea party is the perfect way to dive into celebration—whether you’re planning a mermaid-themed birthday, a beachy bash, or an ocean explorer adventure! With sparkling seashells, sea creature games, and waves of colorful decorations, this theme is a favorite for kids (and grown-ups) who love all things aquatic. But with so many adorable details to consider, planning can feel like navigating the deep blue sea! That’s why we’ve created this handy Under the Sea Party Checklist to guide you through every step, from invites to party favors. Let’s dive in and make your event fintastic!
Under the Sea Party Decoration Set — Ocean blue birthday party decorations include 1 happy birthday backdrop, 1 tablecloth, 1 ocean animal garland, 2…
You can print this check list out right clicking the selecting print, or find the print command under the three dots in the top right. It is for your personal use.
📅 Planning & Prep
☐ Choose a date and time
☐ Create your guest list
☐ Send out under-the-sea invitations (mermaids, sea creatures, treasure maps)
☐ Pick your theme: general ocean, mermaid, pirate crossover, or beach party vibes
🎈 Decorations
☐ Blue and teal streamers to look like ocean waves
☐ Balloons shaped like fish, jellyfish, or sea turtles
☐ Bubble machines or clear balloons for “bubbles”
☐ Seaweed streamers, shells, netting, and coral decor
☐ “Under the Sea” banner or photo booth backdrop
☐ Tableware with mermaids, sea creatures, or ocean patterns
🧜♂️ Dress Code & Costumes
☐ Encourage guests to wear ocean colors or mermaid tails
☐ Provide shell crowns, fish headbands, or pirate hats
☐ Temporary tattoos or face painting station (starfish, waves, scales)
🐬 Games & Activities
☐ Pin the tail on the mermaid or fish
☐ Under-the-sea scavenger hunt
☐ “Fishing” game with magnetic or hook-a-fish setup
☐ Sea creature ring toss
☐ Ocean slime or sand art craft table
☐ Mermaid or pirate dance party with ocean music
🧁 Food & Drinks
☐ Goldfish crackers, “seaweed” (green veggie straws), and shell pasta salad
☐ Ocean Jell-O cups with gummy fish
☐ Mermaid or sea creature cupcakes
☐ Blue punch or “ocean water” lemonade
☐ Birthday cake with underwater theme: coral, mermaids, treasure chests
🎁 Favors & Extras
☐ Mini beach pails with sea-themed goodies
☐ Mermaid or sea animal stickers
☐ Shell necklaces or ocean-themed bracelets
☐ Custom thank-you tags (“Thanks for diving in!”)
☐ Ocean-themed music playlist for ambiance
🐳 With this checklist in hand, your under-the-sea party is sure to make waves and create magical memories!
With your checklist complete and your imagination unleashed, your under-the-sea celebration is sure to be a magical tide of fun, laughter, and unforgettable moments. Whether your guests are mermaids, pirates, or ocean explorers, they’ll swim away with smiles and sweet memories. So drop the anchor, cue the bubbles, and get ready to party beneath the waves!
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