Transportation ...
Belgium’s public transport is world class and all it’s highways are toll free.
Within Flanders you have several choices for local transport. You can of course walk or ride a bike to most places you will need. If that is to far you can also catch a bus or tram (when in a bigger city) to you desired destination. For longer distances there is also a very integrated train system within Belgium with several international connections.
The cheapest way to travel on De Lijn, the bus and tram service, is with a “lijnkaart” which is 8 euros for a 10 trip pass. You validate it using the little yellow box on the bus or tram. For the rail service in Belgium the use of a Go Pass is your best bet if you are under 26. The Line Pass is for people over 26 years old, and like the Go Pass, it allows you 10 one-way trip to any where from anywhere in Belgium for a low cost. If you trip is short you might be better off buying a normal ticket.
Car rental in Belgium is available in most large cities and can be found for as cheap as 25 euros a day. You are generally required to be 21 years old and hold a valid drivers license recognized in Belgium, but specific rules are varied.
Flying to Belgium is usually done through Brussels International Airport (BRU), but be aware you might be able to find a cheaper (and sometimes direct) flight to airports such as Amsterdam (AMS), Paris (PAR) and London area (LON). All of which are a short train ride away, but be aware of the extra cost (and time) required to get to and from these airports. For flights within Europe to Belgium there are several smaller airports, mainly Charliori (CRL) serviced by Ryan Air. There are also small charter airports in Oostende (OST), Antwerp (ANR) and Lille (LIL), France. These airports usually require a bus ride from a main train station to reach them.
Links:
De Lijn - www.delijn.be
NMBS-SNCB - www.b-rail.be