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Long Weekend Base yourself in Kotor and spend your first 2 days there, allowing time to visit Perast and Lovćen National Park and dedicating your final day to Budva and Sveti Stefan. If you have additional time, go hiking in Biogradksa Gora National Park.
One Week Begin with 2 days in Kotor, allowing time to visit Perast and Lovćen National Park, followed by 2 nights in Kolašin in Biogradska Gora National Park. Return to the coast (visit Ostrog Monastery en-route) and end your trip in Budva and Sveti Stefan.
Two Weeks Start with the above itinerary, and then add on 2 nights in Zabljak to visit Durmitor National Park, followed by 4 days exploring Skadar Lake National Park. End by checking out the beaches around Ulcinj, especially Ada Bojana and Tropicana.