'i' (duza litera) heard that, you 'must to go' (popraw) 'for' (popraw, to nie jest 'dla Polski'?) Poland. '(tutaj cos brakuje) 'that's' THAT the truth? If you 'will be' ARE in Poland, you must see the sea and mountains. But remember that when you arrive in the summer (no i co tutaj brakuje reszte zdania ktore zwraca sie o 'summer') , because in other seasons of the year (np jakie?) IT is very cold at the seaside, and in (brak przedimka) mountains THERE is snow.
However, 'it's' THERE IS sometimes a problem with accommodation if you book late at night. You should always be a few months earlier (tu cos brakuje) wish to consider (brak przedimka) overnight (brakuje slowa) .