Top-reviewed tours here
Turtle Snorkel, Lunch Buffet
Clifftop Maya ruins, Akumal turtle snorkeling, and a cenote swim, all in one eight-hour guided day tour.
Six bookable tours pair the Maya ruins at Tulum with a swim in a nearby cenote on the same trip (see Worth Visiting?).
Short answer
The most-reviewed listing is Tulum Ruins, Turtles in Akumal and Cenote Tour, rated 4.9 across 2,114 reviews. Prices and free cancellation terms are shown on each tour's booking page.
Top-reviewed tours here
Clifftop Maya ruins, Akumal turtle snorkeling, and a cenote swim, all in one eight-hour guided day tour.

6 hours
Half-day guided tour pairing the clifftop ruins with swims at two cenotes. Runs about 6 hours, with free cancellation. Current price is on the live booking page.
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6 to 7 hours (approx.)
Round transport, Tulum ruins entry, guided walk, lunch, tequila tasting, and swims at 3 cenotes, capped at a small group.
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6 hours (approx.)
Private guide for the clifftop Tulum archaeological zone, then swims at cenotes Xunaan Ha and Taak Bi Ha. Runs about six hours, with free cancellation.
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4 hours 30 minutes (approx.)
A private half-day pairing the clifftop Tulum ruins with a cenote swim, guide and hotel pickup included, roughly four and a half hours door to door.
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7 hours (approx.)
Guided Tulum ruins visit, cenote swim stops, included lunch, roughly seven hours door to door, small group format, free cancellation.
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