thanks everyone for all the great advice!
I think that we will try to start in dubrov. 3 days there without car.
1 day trip w/rental to kotor.
on to korcula/hvar for one night each or 2 on one of them?...via ferry.
ferry to split - 2 days pick up rental car
drive to plitvice 1 night there
drive to istria - 2 nights rovinj
day trips to hill towns
drop off car @ rijeka
train to ljub. 1 night
train to bled 1 night
rent car in bled and drive through alps back to ljub. 1 night
day trip to skocjan cave
1 last night in ljub.
home
this makes much more sense...using pub. transportation for most of the trip. renting a car in each country to avoid drop off charges.
since we are splitting cost of rental, it shouldn't be too bad.
chris...I have heard that bled is pretty touristy as well. so one day one night there should be enough. maybe we could venture to bohinj for a hike!