Playa Viva Resort and Residence Community, in Zihuatanejo, Mexico
What you give: The whole family can go on fun night patrols to find eggs of endangered leatherback turtles (think an eco-friendly egg hunt) and carefully bring them back to the sanctuary to guard against night predators. Everyone will get an even bigger kick out of returning to the beach the next morning to release baby turtles that hatched.
What you get: Pretty beaches, a great pool, family kayaking, and a kid-friendly hike through a coastal forest -- need we say more?
Rates Start at: $395 per night for two adults and two kids, including meals, airport transportation, yoga classes, spa services, and a donation to the turtle sanctuary (playaviva.com).