I haven't been to Toro but it's on the way to my mother's home town in Zamora. Toro is well-known for its wine and it's only 33 kilometers from Zamora.
In my opinion, you should try to visit Zamora during the Holy week (it's one of the most popular Holy weeks in Spain) and then go to Toro on a day trip. Although I haven't been there, I don't think there is much to do in Toro. Just remember to buy some wine and visit the village.
Auto-res operate the route from Madrid to Zamora stopping at Toro. There are several buses a day including a Express service.
And last, here you have a list of links about Zamora (I'm afraid most of them are in Spanish only):
Guia de Zamora Buscador de turismo de Castilla y León Diputación de Zamora Zamora guide from Iberica.com (By the way,
http://english.iberia.com is one of my favourite websites. Check it out).
And check out also,
La Netro Regards,
Antonio
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The best tips from your favourite hostal in Madrid.
Hostal Chelo at
http://www.chelo.com