All Boating Charters
- 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
- Smart Charter Ibiza – Riva 86
- Smile Boats – Kattum K30
- Smile On Board
- Smokin Hooks
- Smooth Sailing Of Miami
- Snap Decision Charters
- Snooky Tours *Private personalized tours*
- Snorkel Raya Tours
- Snorkel/Shelling Eco Tour
- Snorkeling More Sub – Mate
- Snorkeling Trip With Tamarindo Surf & Tours
- Snorkeling With Sea Turtles
- Snorkeling, fishing, Beach Day
- SoFlo Charters
- SoMax Fishing
- Sofi Boat
- Sol & Sal
- Solara Maldives
- Sole Sale Sardinia
- SoleMare LLC
- Soleil Sport Fishing – Boat Tours
- Solevela Sailing Yacht Charter Go One
- Solitude Fishing Charters
- Solmar 600
- Solmar Aegina Villa & Yacht
- Solo Good
- Solrise Cruises – Sail La Vie
- Something Fishy Charters
- Somewhere - Ultimate Catamaran Expedition
- Sonny's Boat Tours and Charters
- Sorrento Bliss Charter
- Sorrento Experience
- Sorrento Luxury Charter – Axopar 37 ST
- Sorrento Luxury Charter – Rib 780
- Sorrento Luxury Charter – Riva Rivale 56
- Sorrento Sea Service – Siren
- Sorriso Boat Tours – Capri & Amalfi
- Sorta Salty Charters
- Sortie Bateau 06 – Riviera Boat Trips Cannes
- Sota Travel Zakynthos – Rayan
- Sota Travel – IOSIF-TZOUNIOR
- Sota Travel – NIKI - ANTRIANA
- Sota Travel – SIFI - DIANA
- Sotab Excursion
- Sottovento Boat Rentals
- Soundblaster
- Soundside Tours
- South Ari Lodge
- South Cruise Adventures
- South FL Charters
- South Florida Tiki Charters
- South Flow Charters
- South Jersey Outfitters
- South Ole Sails – Beneteau Oceanis Clipper 41
- South Ole Sails – Jet Ski
- South Ole Sails – Quicksilver 755
- South Padre Fishing Guide
- South Padre Island Pontoon Tours
- South Sea Charters
- Southern Angler Fishing Charters
- Southern Angler Fishing Charters
- Southern Angler Fishing Charters
- Southern Angler Fishing Charters