I'm accompanying my husband on a work trip to Europe and will be in Darmstadt for four days on my own. I'll spend one day exploring Darmstadt and then would like to take the train on day trips to other sites in the area. I've never been to Germany but we're planning to fly into Munich before the meeting and tour Salsburg, Fussen, and Munich before drving to Darmstadt via Rothensburg. I prefer smaller towns and plan to go to the Burg Eltz castle one day. Can anyone recommend other day trips from Darmstadt? Also, given that I'll be taking public transportation while on my own - both trains and buses, I assume - is there a 3 or 4 day pass that would be more economical than individual tickets? Thanks.