We have hundreds of fresh water lakes that are near the salt water that have Tarpon.
In Florida we have lots of small and medium size lakes that are very near the salt water and many have land locked Tarpon in them.
Here is a video of a couple of young anglers who catch a nice Tarpon on a fly in a golf coarse pond.
It is easy to find little brackish creeks, lagoons and ponds with Google earth.
https://www.youtube.com/watch?v=f5KAKCRfB50
The warm months are best for these small Tarpon in Florida.
You could fly to southern Florida, rent a little cottage for a week and a small rent-a-car and fish on foot.