The Crown Paradise Club Cancun (starting at $399 per person for four nights) is one of the most family-friendly resorts around, and is an ideal holiday option if you have kids aged 18 months to 12 years. Kids aged 4 to 12 will love splashing around in the mini water park and exploring the pirate ship in the Kids' Paradise Club, and younger kids from 18 months to 3 years will be safe and entertained in their own Baby Paradise Club. Costco's package includes various resort credits, but the biggest selling point is that if you book a trip between June 30 and October 31, 2019, up to two children ages 12 and younger will stay free.