Tourist information
You can find data about lodging, restaurants, excursions, museums, etc. in the official website of the Tourist Office of Tandil.
How to arrive?
There are many daily bus services between Buenos Aires and Tandil that depart from Retiro or Liniers bus stations.
If you wish to compare prices and schedules between the companies you can consult several sites in English, e.g. Omnilíneas, etc.