in poland it isn´t also not a problem to ride along the coast. We have done it in 2005. we started at the last train station at usedom-Peninsula and went straight east to Gdansk. Thre are several small roads an less hills. So cycling is easy and there a lot options for accomodation. In a strip of 20 km at the coast there are a lot of tourism industry ind infrastructure. In august when in poland are publich hollidays is it very crowded. If you dont like this, you should ride a little bit more south, away the coast.

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