Croatia, Montenegro and Bosnia itinerary input appreciated!

Hi! My partner and i are traveling to Croatia, Montenegro and Bosnia for just about two weeks this summer!

Even though half our trip isn't in Bosnia, i hope its ok to ask here for tips for our week in Bosnia!

We are going to be reliant on public transport. We are going for a slow travel vibe, with main activities beeing exploring, walking around and experiencing the local feel and the occasional museum and such. Budget friendly. Also we are partially trying to eat plantbased, and know that these destinations might not be the easiest to keep doing that, so any info on places to eat and also specific dishes that are plantbased are very welcome!

This is our itinerary so far! Looking for input and experience!

Day 1-3 - Dubrovnik, Croatia.

Arrive in Dubrovnik in the morning and taking a slow first day after travels with a long layover (so probably not too much sleep). Either we'll spend both following days in Dubrovnik, or taking one daytrip to Cavtat. Open to tips and ideas!

Day 4-7 - Kotor, Montenegro.

Bus from Dubrovnik in the morning to Kotor in Montenegro. Exploring Kotor, the Does anyone have any experience with how long border crossings take in the summer months? In Kotor we will explore old town, the old city walls etc., hike to the fortress and probably take some chill time. Also contemplating a day trip to Budva, opinions? Also open to any tips and ideas here!

Day 8-10 - Mostar, Bosnia

Bus from Kotor to Mostar. Since this is a longer busride, we are especially here wondering if anyone has experience with how long border crossings take in summer? In Mostar we will also take our time exploring around the town. Any recommendations are welcome!

Day 11-15 - Sarajevo, Bosnia.

Train from Mostar to Sarajevo. Again we will explore the town, and want to visit some museums/historic sites. Any tips welcome! Also tips for daytrips doable possible with public transport are very much welcome, and other tips for Sarajevo itself!

Day 16 - fly home.

Thank you in advance for any info! :)