...Croatia is a great destination for a honeymoon or for any other reason.
A co-worker did that last year, and loved it.

That said, you should pick your exact destinations carefully in Croatia, because inspite of its relative small size the country varies greatly, and because you're going at the time when there are a gazillions of tourists there - read; can be crowded and expensive.

Some of the more popular destinations are the Dalmatian/Istrian coast; towns like Dubrovnik, Split, Opatija and islands like Hvar, Korcula.

The interior of the country is just as pretty, imo, but like I said some of us are biased.

I recommend you pick a good book about the country, and surf the Internet for info well before you go there.

Another thing, it will take you a couple of days to drive from Paris to Croatia - not taking into consideration sightseeing in between, so plan on a l e n g t h y honymoon!