Best major airport to fly into and out of Europe. We have reward points to pay for round trip. But we need to get to Split in Croatia, then near Stuttgart, and finally to Florence for different parts of our trip. Need suggestions for flight connections, and/or train or bus, or even car. We do have plans for what we are doing most of the trip.
The places you list are fairly spread out so I suggest flying. Two good web sources for you are Rome2Rio.com and skyscanner.net. Rome2Rio is a good source for looking at travel options (plane, bus, train, etc.) while skyscanner.net provides you with good air options/pricing. Where will your flights originate? Which airline do you have points with?
Research tools:
Rail: seat61.com
Air: skyscanner.com