Here are well‑known all‑inclusive (or full‑board/all‑meals + extras) luxury resorts and high‑end properties in Sri Lanka, grouped by region with short notes on what they include and why guests pick them. I’ve cited recent travel listings and resort sources so you can check current packages and rates before booking.

South coast / Deep south

• Anantara Peace Haven Tangalle — luxury coastal retreat with high‑end dining, spa and wellness packages, private villas and curated excursions (good for couples and wellness). Packages often include meals, some activities and transfers; check the resort for true “all‑inclusive” offers. (srilankatravelandtourism.com)
• Uga Chena Huts (near Yala) — boutique luxury safari/beach huts with private plunge pools; known to offer all‑inclusive packages that can include guided safaris, meals and some drinks. Excellent for wildlife + comfort. (trip101.com)
• The Fortress Resort & Spa (Koggala / Galle area) — boutique luxury property with curated meal plans and wellness options; often sold with meals and activity packages. Good base for Galle and southern beaches. (en.wikipedia.org)

South / Southwest coast (family-friendly all‑inclusive options)

• Riu Sri Lanka (Ahungalla) — large beachfront resort marketed as all‑inclusive (pools, entertainment, multiple restaurants and bars) — a clear all‑inclusive brand for families and groups. (srilankatravelandtourism.com)
• Club Hotel Dolphin (near Negombo / Waikkal) — popular family‑oriented all‑inclusive option with pools, kids’ programs and beach activities. (srilankatravelandtourism.com)

West coast / Bentota area

• Heritance Ahungalla — iconic Geoffrey Bawa–influenced beachfront hotel; luxury property that offers meal plans and occasional all‑inclusive packages through tour operators. Great architecture + beachfront dining. (srilankatravelandtourism.com)
• Cinnamon Bentota Beach (Bentota) — five‑star beachfront property that runs package options (some agents offer all‑inclusive rates); good for beaches and water sports. (en.wikipedia.org)

Cultural Triangle / Hill country (luxury, not typically true all‑inclusive)

• Amaya Lake (Dambulla) and similar luxury eco‑resorts — they offer full‑board and wellness packages (often including meals and some activities) rather than broad all‑inclusive drink/entertainment plans. Ideal for cultural sightseeing and relaxation. (srilankatravelandtourism.com)

Practical booking tips

• "All‑inclusive" definitions vary: some Sri Lanka resorts offer true all‑inclusive (meals, selected drinks, activities and entertainment), while many luxury properties sell full‑board or half‑board plus optional activity/spa credits. Always confirm exactly what’s included (meals, premium drinks, transfers, excursions, guided safaris, taxes/fees). (trip101.com)
• Best regions: south coast (Tangalle, Galle, Ahungalla, Bentota) for beaches; Yala for safari + beach blends; Negombo/West Coast for family‑friendly all‑inclusive chains. (trip101.com)
• Price guidance: luxury all‑inclusive rates vary widely (from mid‑$200s USD/night for big all‑inclusive chains to $500–$1,000+ for boutique luxury / private‑pool villas or safari packages). Seasonal peaks (December–March, July–August) raise prices. Confirm current rates with the resort or an up‑to‑date booking site. (trip101.com)

If you’d like, I can:

• Check current all‑inclusive package availability and prices for any of these resorts for your travel dates (I’ll search live rates), or
• Narrow options by region (e.g., Tangalle vs. Bentota), group type (couples vs. family), or budget.

Which would you prefer?