All Boating Charters
- Seascape Charters
- Seaside Charter Company – Wrightsville Beach
- Seaside Napoli
- Seaspray
- Seatours – Bavaria Vision 46ft
- Seatours, Catamaran My Joy
- Seaventure Dubrovnik – Cap Camarat 6.5WA
- Seaventure Dubrovnik – Karnic SL 741
- Seawalker Excursions
- Seañorita 43ft Sea Ray Sundancer
- Second Generation Bay Boat Charters
- Second Generation Fishing Charters Key West
- Second Sport Charters
- Secret Cays Bahamas
- Seek N Fishing Charter
- Semi-Sub Seychelles Ltd
- Serenity Boat Charters-Bluelagoon,Comino&Gozo
- Serenity Charters TCI
- Serenity Sea Tours
- Set 'Em Up Ecological Adventures
- Set Sail Tours
- Seven Day’s Snorkeling
- Seven Star Dinner Cruise
- Shaka in San Carlos
- Shala River Tour from Komani Lake
- Shallow Water Experience LLC
- Sharkcana Yachts – Private Yacht Excursions
- Sharky's Charters
- Shark’s Tours
- Shearwater Charters
- Shockwave Charters
- Shoki Charters
- Shooter Dog Cruises
- Shore Chaos Charters
- Shore Service
- Shore Thing Charters OCNJ
- Shore-Thing Charters
- Short Skirts Sportfishing
- Shotime Charters
- SiP Travel – Blue Cave Adventure
- SiP Travel – Boka Bay Tour
- Sicily Fishing Charter
- Sicily Yachting Club
- Side Quest Charters
- Sidekick Charters
- Sierra Surf House
- Siesta Cruise Boat Tours
- Siesta Key Snorkel
- Sightseeing, Booze Cruise
- Sightseeing,Booze,Sunset and Lake Boca Cruise
- Signature Island Charters
- Silvana Yacht
- Silver Thatch Watersports – Diver
- Silver Thatch Watersports – MB
- Silver Thatch Watersports – Silver Thatch II
- Silver Tuna Sport Fishing
- Simon Says Charters
- Sin Priza – Snorkeling Tour
- Singing Reel Charters
- Single Floor Yacht - Best Deal Of The Month!
- Sip N Sea Charters – Fun In The Sun!
- Sip and Sea Charleston
- Sip and Sea Charleston
- Siren – 60' Iconic Luxury Yacht
- Sirena Moris
- Sirena – Splav & Brod
- Sirigos Yachting
- Sisi Boating Experiences
- Six Shooter Charters
- Skadar Lake – Boat Cruise
- Skarpina Budva
- Skinny Dipn Charters
- Skipjack by Amberjack-Snorkel/Sunsets/Whale
- Skipper Allan Sea Excursions
- Skipper Charters
- Skipperdan Boat Ltd
- Skirtchaser Charters
- Sky Blue Reef Tours
- Sky Walker Yachts – 96 FT Caliente
- Sky Walker Yachts – C-62
- Sky Walker Yachts – S-60 Infinity
- Sky Walker Yachts – X-63 Amie
- Sky Walker Yachts – С-52 Sky Walker
- Skyway Fishing Tours
- SlackTyde Charters
- Slick Calm Charters
- Smile Boats – Kattum K30
- Smokin Hooks
- Smooth Sailing Of Miami
- Snap Decision Charters
- Snitram
- Snorkel &. Turtle Adventure on 43'
- Snorkel/Shelling Eco Tour
- Snorkeling Trip With Tamarindo Surf & Tours
- Snorkeling With Sea Turtles
- Snorkeling tour Gili air, Gili Meno and Gili
- SoFlo Charters
- SoMax Fishing
- Sol & Sal
- Solara Maldives