The staff in the Tourist Information Centre in Darmstadt's Luisencentre has all the answers to your questions: they are standing by with all sorts of tourist information, they can advise you about what is on offer for tourists, they can tell you about guided tours, Darmstadt arrangements and overnight possibilities.
In addition, Darmstadt souvenirs and tickets for events in Darmstadt are also on sale, as well as tickets for events in the region which have been organised by "Darmstädter".
Souvenirs can purchased in the Darmstadt Shop, the tourist information centre at Darmstadt's Luisenplatz, or here directly online (the online shop at the moment is online available in German).
Darmstadt Shop Luisencenter
Tel.: +49 6151 - 1345-13
Fax: +49 6151 - 1347-5858
Mon to Fri: 10 am to 6 pm
Sat: 10 am to 4 pm
April-Sep: Sun 10 am to 2 pm
Closed on public holidays.
In particular, travellers with a handicap shal be given reliable information on the extent to which tourist facilities are accessible to the disabled at the destination.
You can find the complete report here.
Further information about accessibility of sights and institutions in Darmstadt can be found here.