Make this a summer break with two contrasting shores: Kotor’s stone lanes and steep mountain backdrop, followed by Budva’s open-water beaches. Spend two nights in Kotor, leaving a complete day for the walls or a bay outing, then move once to Budva for an afternoon swim and an evening in its walled centre. The intercity bus makes this two-base plan possible without a car.
June through September suits the intended coastal holiday; July and August bring the busiest beaches, hot exposed climbs and slower roads. Put the active walk early, keep the middle of the day for lunch or a shaded pause, and enjoy the water when conditions suit. The four-day length works best with an arrival that leaves some of day one available. A late flight leaves only one full Kotor day, so use the nearby sights rather than squeezing in a mountain detour.