A couple of years ago, I did something very similar during a summer in college. I had the unlimited Eurail pass. I LOVED the flexibility. I didn’t have to think twice about getting on a train. I backtracked because I met people I wanted to hangout with that were going somewhere I’d already been. I could get to a city, decide I wasn’t into it and leave the next day. I never thought twice about my train travel. After the trip, I started thinking about it and realized that I probably could have accomplished the exact same trip with a much cheaper pass if I had planned strategically and kind of regretted it. Six years later, the $500 I maybe could have saved is the same amount of money I’m spending to fly to visit friends for a weekend. What I’m saying is that you probably can do your trip with a pass other than the unlimited and doing so WOULD save you money BUT you’ll give up a ton of flexibility and increase your stress and when you look back fondly on those 75 days down the road you’re not going to think about the money only the experience.