All Boating Charters
- Serenity Charters TCI
- Serenity Sea Tours
- Serenity Speedboat Hurghada
- Serenity Sunset Cruise Destin FL
- Sestri Sea Service – Callegari 690
- Sestri Sea Service – Eolo 6.9
- Sestri Sea Service – Mirò Bat 23
- Set 'Em Up Ecological Adventures
- Set Sail Tours
- Setsail World – Experience No Noise Sailing
- Seven Day’s Snorkeling
- Seven Star Dinner Cruise
- Sg Group Boat Charter Naples – Bombastica 28
- Sg Group Boat Charter Naples – Darlin 25
- Sg Group Boat Charter Naples – Squalo Junior
- Shaggy's Diving
- Shala River Tour from Komani Lake
- Shallow Water Experience LLC
- Shangri-la Yacht Rentals Vancouver – Dave
- Shangri-la Yacht Rentals Vancouver – Kane
- Shangri-la Yacht Rentals Vancouver – Maxum
- Shared Boat Trip to the Island & Snorkeling
- Sharkcana Yachts – Private Yacht Excursions
- Shark’s Tours
- Sharm Activities
- Shasa Catamaran Cruises
- Shearwater Charters
- Shell Island Dolphin Tour
- Shell island tour
- Shelton's Charter Fishing
- 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
- Sick Day Boat Tours – San Diego
- Side Quest Charters
- Sidekick Charters
- Sierra Surf House
- Siesta Boat Charters
- Siesta Cruise Boat Tours
- Siesta Key Snorkel
- Sightseeing,Booze,Sunset and Lake Boca Cruise
- Signature Island Charters
- Silvana Yacht
- Silver Dollar Charters
- 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
- Sinbad – Hanse 370
- Singing Reel Charters
- Sip N Sea Charters – Fun In The Sun!
- Sip and Sea Charleston
- Sip and Sea Charleston
- Siracusa by Boat
- Siren – 60' Iconic Luxury Yacht
- Sirena Moris
- Sirena – Splav & Brod
- Sirigos Yachting
- Sirius Fun Experience
- Sisi Boating Experiences
- Sisu Boat Charters Malta – Comino,Blue Lagoon
- Six Shooter Charters
- Skadar Lake 2h Boat Tour from Virpazar
- Skadar Lake 3h Tour to Kom Monastery
- Skadar Lake – Boat Cruise
- Skarpina Budva
- Skinny Dipn Charters
- Skipjack by Amberjack-Snorkel/Sunsets/Whale
- Skipper Charters
- Skipperdan Boat Ltd
- Skirtchaser Charters
- Skopelos Rib Private Cruises
- 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
- Sky and beach - Cozumel dreams
- SlackTyde Charters
- Slice O Life Charter and Cruise LLC
- Slick Calm Charters
- Slowbro Trips
- Smile Boats – Kattum K30
- Smile On Board
- Smokin Hooks
- Smooth Sailing Of Miami
- Snap Decision Charters
- Snooky Tours *Private personalized tours*