Originally Posted by
Pendingclearance
I'm thinking of making a trip of it and doing tailwheel and seaplane ratings at the end of the upcoming season.
In USA there is no tailwheel rating. There is only a tailwheel logbook endorsement. Simply fly a "conventional gear" aircraft with a competent tail wheel instructor and, if/when the instructor is satisfied you are competent, you will receive a logbook endorsement. I don't know if the experience or endorsement will allow you to fly tailwheel when you get home.
Single engine and multi engine sea can be additional ratings or the first rating issued. Both require a flight test with FAA examiner or a designee.