Traveling with kids

My family is Mexico bound this fall & we're starting to get excited about planning. This will be our 4th time to the area except this time we have 4 kids (ages 2-9 yrs). We've never done AI before because we love food & want a variety but we are doing it this time out of pure convenience - if you've ever been on vaca with 4 hungry kids you'll understand we are fairly familiar with the area though it's been a few years since we've been. Any suggestions for things to do specifically for the kids? Swimming & sand castles is our staple but we may want to do a little exploring. Safety is a key for us and navigating the city a lot isn't an option (we live in a very remote area so my kids aren't used to crowd safety). Our kids are great travelers though & we love for them to see that our tiny bubble is just that! Activity/sight seeing Suggestions ? Ideas? Thank you!!