I want a vacation package including air, and an all inclusive resort on the beach. I want to go somewhere tropical such as Mexico, Costa Rica, Dominican Republic, Cabo, etc. My budget is $500-$700 per person and I wouldn’t mind if there were nice activities nearby such as swimming with dolphins or scuba diving. Thank you.

This is Mission: Impossible.

You don’t say where you’re "home" is
(ie, where you’re traveling FROM….)
But $500–$700 is barely gonna be enough to pay for a plane ticket.
You aren’t even gonna touch 4-nights ANYWHERE in the
Caribbean or Mexico for under $100 per night.
Any all-inclusive resort hotel will be $200 /pp per night, minimum.

Maybe you can afford a weekend in Daytona Beach…. if you drive there….