Myself & a friend are flying to Prague for 2 weeks, but want to do a bit of touring around Czech Republic, Slovakia, Romania, and maybe even Croatia, Yugoslavia, etc.

We got confirmed flights from the UK for £41 rtn, and plan on taking trains overnight between places to keep the accommodation costs down.
Has anyone ever taken a similar trip to this who can share their experiences with us?

Also, are there any out-of-the-way places in Eastern Europe that are worth exploring?

Any help would be much appreciated.......