Whats the best area to stay in the tri-city, we've read that sopot is a popular area
There is a lot going on in Gdansk. If you are on a budget it is probably better to stay in Gdansk there are more budget places. You can get to Sopot by train from Gdansk and it is very cheap and short journey. You can also take the boat to Hel peninsula to visit Hel and Jurata. There are very nice beaches in Jurata. All of the Baltic coastal towns will be very busy in August.
There is a free bus to Gdansk train station from the airport , I am not sure what time they start. There are no train to the airport so it is taxi or bus.