There's nothing in your post that really much narrows your choices down. Pretty much any islands of the Caribbean or any of the beach resort towns of Mexico offer what you describe.

Thank you for your response. Yes, you're correct, I didn't narrow down my choices because I don't have any idea about the Caribbean Islands. I just know we'd like a place that isn't very touristy, has some options for scenic places to visit (like gardens, caves or hiking) and nice beaches to swim in for the kids and the "big" kids.

You'll get more response if you post on the Caribbean and/or Mexico forums.

When you do re-post your question try to give us some idea of the type of resorts/hotels that appeal to you, tell us your budget for accommodations, food and activities (try to be specific, don't use terms like "affordable", won't break the bank" as they are meaningless without a dollar point of reference). Let us know what you liked/disliked about the places you've been and what you hope to find/accomplish on this trip.

Right now, what you described can be found almost anywhere in the Caribbean or Mexico and there are literally 1,000's of places to choose from. You HAVE TO HELP US to narrow down your choices.

Okay, this is all new to me. (First time using Fodor) "Thank you" and I will try to repost as suggested and be more specific.

If you did not want to leave the US, you could go to Corpus Christi and or South Padre Island Texas.

Check out Costa Rica, it has what you are looking for and is accessible from LA and ORD. It's pretty small, lush, warm, pretty safe, lots of fauna.

I second Costa Rica!

New york is the best place or second option is London and third option is India.

I post here again, because i forgot to mention a place and that is Dubai because you are looking for warm place.

My son and his family recently went to Isla Mujeres (a Mexican island in the Yucatan Peninsula) with a group of friends, and had a great time. I've been thinking about it, myself.
http://en.wikipedia.org/wiki/Isla_Mujeres