Here are recommended hotels and resorts in Sri Lanka that are known for on-site or easily arranged water sports (surfing, diving, snorkeling, kitesurfing/windsurfing, stand‑up paddle, jet‑skiing, boat/dolphin trips). I grouped them by region so you can pick by where you plan to go.

South coast (surfing, diving, snorkeling, boat trips)

• Kumu Beach (Hikkaduwa) — surf lessons and surf experiences arranged from the property / nearby breaks. (teardrop-hotels.com)
• Mirissa / Weligama area (multiple hotels and guesthouses) — many hotels work with local dive centres and surf schools for diving, whale/dolphin safaris, surf lessons (Mirissa and Weligama are major surf/diving hubs). Look for dive‑friendly hotels and surf camps in Mirissa/Weligama. (divehotelsguide.com)
• Bentota — luxury properties such as Jetwing Saman Villas and other Bentota resorts offer a range of beach activities (motorised and non‑motorised water sports, boat trips on the Bentota River). Check specific hotel activity desks for diving, snorkeling and motorised sports. (en.Wikipedia.org)

West & Northwest (kitesurfing, windsurfing, lagoon activities)

• Kalpitiya — The Wind Resort / Palm Resort area / Dolphin Beach and other Kalpitiya lodges: a top destination in Sri Lanka for kitesurfing and windsurfing (lagoon and flat‑water conditions), plus SUP and boat trips. Many specialist kite/wind centres are attached to resorts. Best months May–October (main wind season). (sportif.travel)

East coast (seasonal surfing, snorkeling, diving)

• Pasikudah / Kalkudah — beachfront resorts here offer calm shallow bays ideal for snorkeling, kayaking, stand‑up paddle and motorised water sports during the east coast season (roughly May–September/October). Check property activity lists for jet ski, glass‑bottom boat and snorkeling trips. (Seasonality matters: east coast is best in northern summer months.) (en.Wikipedia.org)

Arugam Bay & southeast (surfing)

• Arugam Bay area hotels and surf camps — Arugam Bay is one of Sri Lanka’s highest‑profile surf destinations (best waves in the east coast surf season). Most surf camps/hotels offer board hire, lessons and guides. (en.Wikipedia.org)

Examples of specific properties to consider (representative — confirm current offerings with each hotel before booking)

• Kumu Beach (Hikkaduwa) — surf lessons/experiences arranged. (teardrop-hotels.com)
• Wind Resort / Palm Resort (Kalpitiya) — dedicated wind/kite facilities and centers for kitesurfing/windsurfing, SUP and excursions. (sportif.travel)
• Dolphin Beach Resort (Kalpitiya) — lagoon/beach location; commonly listed among Kalpitiya kite/wind lodges. (en.Wikipedia.org)
• Jetwing Samanvillas (Bentota) and other Bentota beachfront hotels — river/sea boat trips and beach water sports through hotel activity desks. (en.Wikipedia.org)
• Multiple Mirissa/Weligama hotels and dive‑friendly guesthouses — good for diving, whale/dolphin safaris and surf lessons; search “Mirissa hotels dive centre” for current dive partners. (divehotelsguide.com)

Quick tips for picking and booking

• Decide which water sports you want (kitesurf/wind, surf, scuba, snorkel, motorised) — some areas specialize: Kalpitiya for kite/wind; Arugam Bay/Weligama/Hikkaduwa for surfing; Mirissa for diving/whale watching; Pasikudah for calm snorkeling and SUP. (sportif.travel)
• Check seasonality: south/west coast is best roughly November–April for calm seas and south‑west swells; east coast and Kalpitiya wind seasons differ (east peak mid‑year; Kalpitiya winds May–October). Confirm current seasonal windows before booking. (sportif.travel)
• Confirm safety/certification: for kitesurfing/windsurfing and diving, check that centres use certified instructors (VDWS/ISSA for kite/wind, PADI/SSi for diving) and provide rescue cover. (sportif.travel)

If you want, I can:

• give a short list of 6–10 specific hotels with direct links and exact water sport programs (I’ll look up current activity pages and availability), or
• suggest a shortlist tailored to the exact dates and which sports you care about (so I can pick the right coast/season).

Which would you prefer?