I do not see much comparison---Slovenia deserves 4 or 5 days of your time while San Marino can be seen in 3 hours. We loved Slovenia--I would do that.

Rather than a couple of days in San Marino, add a couple of days to Venice.

I've never been to Slovenia, but did visit San Marino this fall. It's a beautiful, tiny country WAY up on a mountain top, but I would agree, it's worth about 3 hours. Other beautiful hill towns, particularly San Leo, are in the area, but if you're planning to travel by public transportation, I don't know that you could see much of the area very easily.

I would also suggest Slovenia or more time in Venice.

It's looking like Slovenia is winning the mind battle here. One factor not mentioned is that my wife and I have a Tuscany trip on the back burner and from there a day trip to San Marino may be easier. Whereas chances of being able to get to Slovenia on some future trip look slim.

[Lexma90, just a note that I consider taxis to be public transportation so it wouldn't be too hard to drive around. Plus, on that future Tuscany trip we will have a car.]

Yes, it sounds like San Marino may fit in with your Tuscany trip a little better. Here was our route when we visited San Marino; it wasn't a Tuscany trip, but it may give you ideas. From Florence, we took the train to Bologna, which is a city I love and use any excuse to visit. We spent one night there, then picked up a rental car and drove to Ravenna, which I also love. We spent much of the day in Ravenna, viewing (for our second time) the mosaics. From there, we drove to San Marino via the not-very-scenic "coastal" road. We arrived there in the early evening, spent the night there, and a few hours in the morning. From there, we drove to San Leo and explored that area, then drove to our base for the next 3 nights, Urbino. Very scenic but very few highways or major roads - mostly small backroads.

On the taxi, that might work, I've never taken rural taxis before, so I don't know if a 1/2 hour taxi ride from San Marino to San Leo would be expensive or cheap - but if you have a car, that would probably be the better way to go.

Enjoy both trips!

Avoid S Marino on weekends especially, even in May when tons of Italians and tourists spending beach holidays in nearby Rimini area descend on the town - mainly it seems to buy lower taxed cigarettes and booze - a tourist trap par excellence in the lower, main town but you can get above the fray to appreciate what is a great hilltown. But yeh for most a few hours here and on out

If you're going to Slovenia check this cool place, it's in Julian Alps,...

http://www.adrenaline-check.com

SLOVENIA! well, I do have to say I have never been to San Marino, so I might be rather biased but we enjoyed Slovenia so much. We stayed in Ljubliana (is that how you write it? I always get the J's confused) for 3 nights (got a good deal through easyclicktravel), and then 2 more nights in a more rural area. This was a great vacation, an awsome country.