Salice Terme is a small town in the Oltrepò Pavese region of the Province of Pavia (PV) in Lombardy. This town was once a very popular destination for locals primarily from the Lombardy region of Italy. The word Terme means "spa" in Italian, and sure enough there are many spas in the town. Although most locals prefer to head for the coast for their vacations, there still remains some decent hotels and food establishments to enjoy. Being that this is in the Oltrepò Pavese region, every restaurant has excellent local wines (local specialty is Bonarda, red wine with a slight carbonation - try it!) to offer as well as the famous Salami and other varieties of ham.
Probably the best way to visit the city since you may want to get around to the local vineyards or an Agriturismo, a good reference point for your GPS is Strada Provinciale 1, Salice Terme, PV.
In order to reach this town by public transit, it will be necessary to catch a bus from Voghera. To get to Voghera, consider a train from Milan, follow the instructions on that page for instructions to get to Milan. Trains leave for Voghera (via Pavia) from Milano Centrale roughly every 30 minutes. Tickets can be bought in the Trenitalia ticket office, or alternatively it is possible (and often quicker) to buy tickets and check train times using the Trenitalia self-service ticket machines (most of which have an English language option, along with other major languages). Tickets cost between 5.80 and 8.50 euros depending on whether you take a slower regional train, or the faster Intercity trains. The regional trains will run along the Genoa - Pavia - Milan route, just make sure your train is stopping in Voghera (the ticket machines will let you know, based on the departure time).
Once in Voghera, the bus stop is just outside of the train station. You should be able to find a bus schedule and buy a ticket in the station. Buses run from Voghera to Salice about once every 30 minutes.
You can access several restaurants and bars by walking in the main part of the city (it is very small), but you will probably want a car to see the rest of the beautiful region.