RE: Hotel and Trade Fair Transportation
Killesberg Messe (the fair grounds) is served by Stadtbahn line U7 (dark green on the below linked map).
Stuttgart city centre map with sights
At the time of the Intervitis Stuttgart Spring Festival (a big beer festival) is held.
some highights of Stuttgart
Wilhelma Zoo and Botanical Garden
mineral springs (the 2nd biggest in Europe)
e.g. Das Leuze is a nice combination of mineral bath and leisure pool
These places are however not really in walking distance. Or it's at least a walk of one hour or so. Best will be to get a 3-day ticket for local public transport
Opt for the EUR 12,80 network version.
Two highlights of the Stuttgart region you can reach in approx. 15 minutes by S-Bahn (covered with the above suggested network version of the 3-day ticket) are Esslingen and Ludwigsburg.
Esslingen has a nice medieval city centre. One of the biggest cities in Germany not destroyed in WWII.
Ludwigsburg is for Germany an incredible young place (less than 300 years old).
Ludwigsburg Palace is the greatest German Baroque Palace.
Nice is also the Neckar Valley between Heilbronn and Heidelberg. Which is also part of the Castle Road. Something you can easily include into your route back to Franfkurt.
For hotels see the above linked tourism sites.
Or use e.g. http://www.hrs.com
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