Tallinn is the main travel hub of Estonia! If you have time, we highly recommend visiting to explore the old town and its rich history! https://visitparnu.com/en/
Another fun city to explore if you are already in Europe!
There is an easy 2 hour ferry which travels frequently between Helsinki and Tallinn. A fun option might be to fly in, explore Finland and then ferry to Tallinn. Finland is relatively more expensive than Estonia though, so be warned!