Great — here are highly regarded, genuinely eco‑minded tour options across Southeast Asia (country, what you’ll do, why it’s eco‑friendly, and a source you can check). I focused on operators and programs with clear conservation, community or animal‑welfare credentials.

Top eco‑friendly tours / operators

1. Borneo (Sabah, Malaysian Borneo) — Kinabatangan & Deramakot wildlife safaris (Borneo Eco Tours / local conservation lodges)

• What: river cruises and guided night/day jungle walks to see proboscis monkeys, pygmy elephants, hornbills and other endemic wildlife; stays at low‑impact rainforest lodges (Sukau, Deramakot).
• Why eco: operators work with protected areas, use small-group guided visits, support local conservation and community projects.
• Source: Borneo Eco Tours (sample itineraries & conservation focus). (borneoecotours.com)

2. Borneo (Sabah & Kalimantan) — Orangutan rescue & rehabilitation / reforestation programs (Sepilok, Bornean Orangutan Survival / Samboja Lestari)

• What: visit rehabilitation centres (Sepilok), sanctuary projects and restoration sites; learn about rescue, rehabilitation and rewilding.
• Why eco: funds and visitor fees support rescue, rehabilitation and large‑scale habitat restoration.
• Source: Sepilok Orangutan Rehabilitation Centre; Samboja Lestari / BOS Foundation. (en.Wikipedia.org)

3. Northern Thailand — Ethical elephant sanctuaries (Elephant Nature Park and similar “no‑ride, no‑performance” sanctuaries)

• What: day visits or multi‑day stays where you observe, feed and help care for rescued elephants (no riding or shows).
• Why eco: rescue/rehab focus, long‑term welfare and education; revenue supports care and anti‑exploitation work.
• Source: Elephant Nature Park (programs and ethics). (elephantnaturepark.org)

4. Komodo National Park, Indonesia — Low‑impact liveaboard & conservation‑minded boat operators

• What: snorkeling/diving with reef conservation briefings, guided island treks on Rinca/Komodo for wild Komodo dragons, overnight small‑boat trips.
• Why eco: many reputable operators limit guest numbers, support reef conservation and park fees channelled to protection. (When booking, choose operators that explicitly state conservation partnerships and low guest capacity.)
• Source: Komodo National Park guidance and conservation programs (see official park listings and reputable dive/operator sites). (en.Wikipedia.org)

5. Indonesia (Samboja / Borneo) — Conservation stays with BOS Foundation (Samboja Lestari)

• What: eco‑lodge stays that directly fund orangutan & sun bear rescue, plus hands‑on reforestation/community projects.
• Why eco: integrated conservation + community development (people, planet, profit model).
• Source: Samboja Lestari / BOS Foundation. (en.Wikipedia.org)

6. Philippines — Palawan eco & community tours (small operators focusing on sustainable island management)

• What: responsible island hopping, guided mangrove/sea grass restoration, community‑led nature experiences (El Nido/Taytay/Coron region operators increasingly offer certified eco options).
• Why eco: community‑based tourism, reef‑friendly snorkeling, local‑benefit models (pick operators with clear sustainability practices and Marine Protected Area partnerships).
• Source: regional responsible tourism guidance and operator pages (look for operators promoting MPAs/community projects). (ecotourmalaysia.com)

7. Laos — Community‑based ecotourism around Luang Prabang & Bolaven Plateau

• What: homestays, guided trekking with local villages, coffee/forest restoration projects on Bolaven Plateau.
• Why eco: income for remote communities, small‑group low‑impact trekking and cultural conservation.
• Source: community tourism program listings and Lao tourism sustainable initiatives. (ecotourmalaysia.com)

8. Vietnam — Cát Bà & Halong Bay low‑impact cruises / community conservation projects

• What: small‑boat cruises that combine kayaking, hiking, and community livelihoods programs (e.g., fisheries co‑ops) rather than large tourist ships.
• Why eco: fewer guests, support for local conservation and non‑motorized activities.
• Source: sustainable operator listings and national park guidance. (ecotourmalaysia.com)

How I chose these (quick criteria)

• Clear conservation, rehabilitation or habitat‑restoration work.
• Community benefit or local partnerships (homestays, employment, revenue sharing).
• Animal‑welfare policies (no riding, no shows for elephants; no touching of certain wildlife).
• Small‑group, low‑impact itineraries and lodges with environmental practices.
  (Where possible I prioritized operators and projects with transparent programs and third‑party recognition.) (borneoecotours.com)

Booking tips and how to verify operators

• Look for clear statements about conservation outcomes and where your fee goes (e.g., sanctuary funding, reforestation, community projects). If it’s vague, ask. (en.Wikipedia.org)
• For wildlife: choose “hands‑off” experiences and sanctuaries that prohibit riding/performances. Elephant Nature Park is an example. (elephantnaturepark.org)
• Prefer smaller lodges/boats and operators that limit group size and give pre‑visit briefings about responsible behaviour (no feeding wild animals, no single‑use plastic, reef‑friendly sunscreen).
• Check recent reviews and news (operators and wildlife centres can change policies), and confirm current conservation credentials before booking. (If you’d like, I can look up specific operator certifications or recent reviews for any tour you’re considering.)

If you tell me which countries or activities you care about most (jungle wildlife, orangutans, diving/reef conservation, elephants, community homestays), I’ll pull specific current tour recommendations, sample itineraries and direct operator contact pages with up‑to‑date availability and pricing.