Right after Cosmos is Beaches -- long stretch of AI...then Couples Swept Away ---- very long stretch of AI.
If it's the flavor of 7 mile beach you want to show your mom, I agree with going in after Couples Swept Away, and you can still get plenty of Old School Ja flavor.
I also agree Cosmos is great if you don't mind a little hike after that to get out of AI land.

Also, keep in mind, you can enter almost any non-AI property from the street by politely explaining to security that you would like to check out their bar for a drink. You can also get to the street the same way - ask if it's ok to walk to the street to check out the property on your way. I've never been refused. And sometimes, get a nice little tour.