Any and all suggestions appreciated
How are you getting to Montenegro? Will you have a car? Will you recently have visited Dubrovnik? Have you been to Turkiye or Albania?
What time of year?
When I am thinking of going somewhere new to me, I like to take in a lot of organized information (guidebooks, articles) so I can decide if it appeals to me. Why did you choose Montenegro if you don’t know what you want to do while there? Do you have familiarity from reading a guidebook or perhaps looking at the country’s website? https://www.montenegro.travel/en
Here’s my trip report. Maybe it will help you decide what area you would like to see. There’s a lot there.
https://community.ricksteves.com/travel-forum/trip-reports/16-nights-in-montenegro
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