Jaguar Park is the newer conservation frame around Tulum's coast, created to protect a strip where jungle, dunes, beaches, and archaeological tourism press hard against each other. For travellers, it is most relevant as part of the ruins-and-beach day rather than as a separate wilderness park.
Expect managed access and changing rules as the area develops. The reason to include it in your plans is the setting: Caribbean water, coastal scrub, and the chance to move between Tulum's famous ruins and a broader protected landscape instead of treating the site as a single photo stop.