ampaski

Is it possible to hire a car in Venice for 3 weeks to drive down Croatian coast to Dubrovnik then upto Sarajevo where we hope to leave it. If not possible please advise with alternative options. Any tips and tricks are welcome.

neckervd

May be you read the answers you already got in your other threads. It may not be particularly helpful to open new threads in order to ask the same again and again.

Personally, I don't understand why you plan to go by train from Rome to Venice in order to rent there a car for a direct ride straight to Dubrovnik, without visiting anything in between. IMO a volotea flight VCE - DBV would be a much better choice.
Alternatively you could
backtrack to Rome and fly from there to DBV;
go by train from Venice to Bari and cross the Adriatic sea by Bari - Dubrovnik overnight ferry;
go by direct bus from Venice to Pula, by catamaran from Pula to Zadar and by bus from Zadar to Dubrovnik;
go by train from Venice to Trieste and by bus from there to Rijeka - Split - Dubrovnik.

neckervd

.... or leave Venice at 14.55 by direct train to Ancona, change there to the overnight ferry, arrive at Split at 7.00 and go on by catamaran (4-5 hrs journey) or bus (4 - 4 1/2 hrs journey).

kja

Yes, please see your other thread:
https://www.fodors.com/community/eur...tia-bosnia.cfm

neckervd has identified some great options; for other transportation alternatives to a rental car, check rome2rio.com -- just be sure to check the links to which it directs you, as it is not sensitive to seasonal variation in schedules.