Upvote:1
I crossed the border from Slovenia into Croatia a few weeks after they joined the EU (but not Schengen yet), it was merely a few guys checking your passport and stamping it, not even one question asked about who I am or what I was going to do in Croatia, neither anyone else accompanying me. I believe the situation must be even smoother now, given that Croatia is hopefully joining Schengen soon.
Upvote:1
Border police in former eastern Europa can behave different from most of Europa. Some years ago I was travelling with a Australian student - who had all the proper paperwork. However, he was denied entry into the Czech Republic. This was before they became a part of Schengen (2004 or so).
They had no reason to do it, it was purely based on a whim.
Call the Croatian embassy in Sweden - http://www.embassypages.com/missions/embassy3265/ and ask what you need to do to be sure to get entry. Get a name and some contact info you can call if you have problems.