Here are several well-known Bentota hotels that offer on‑site water‑sports (motorised and/or non‑motorised). I’ve listed typical activities each hotel advertises and added sources so you can confirm current offerings and prices.

• Cinnamon Bentota Beach — water‑skiing, jet‑skiing, wave runners, banana/disco‑donut rides, canoes and river/sea excursions (river meets sea water‑sports centre). (cinnamonhotels.com)

• Centara Ceysands Resort & Spa (Aluthgama/Bentota) — full water‑sports centre: jet skis, wakeboarding, knee‑boarding, banana boats, snorkeling, canoeing, sailing (and dive trips on request). The resort sits between the Bentota River and the Indian Ocean so you get river and ocean options. (tropicalsky.ie)

• AVANI Bentota Resort (formerly or branded AVANI) — on‑site water sports area offering wakeboarding/windsurfing, jet skis and board rentals; excursions such as boat safaris and diving can be arranged. (Oyster.com)

• Taj / Vivanta (Taj Bentota Resort & Spa / Vivanta by Taj) — concierge arranges a wide range of Bentota water‑sports (banana boats, bodyboarding, water‑skiing, jet‑skiing, diving) and lagoon excursions; activities are available through local water‑sports operators. (tajhotels.com)

Other options and notes

• Many smaller beachfront hotels, guesthouses and independent operators on Bentota Beach and the Bentota River also run jet skis, banana boats, windsurfing, SUP, snorkeling and river safaris — ask your hotel concierge or the resort water‑sports desk. (Cinnamonair.com)
• Best season: November–April usually has calmer seas and is recommended for most water sports in Bentota; check local conditions and the hotel’s water‑sports desk before booking. (Cinnamonair.com)

If you’d like, I can:

• Check availability and current prices/duration for a specific hotel and activity on the dates you plan to travel (I’ll look up live info), or
• Provide a short comparison (prices, family‑friendliness, river vs ocean access) between two or three of these resorts.