Be careful where you park, A lot of streets in Headingley are for permit holders and you'll get a
parking ticket. Its hard to get parked between the ground and the high street (Otley Road)
The best place to park is Beechwood Crescent or one of its side streets. Then walk over the railway bridge to the ground (you can see this on Google Maps).
Or, one good option is the many frequent buses from Leeds city centre, that run along Otley Road and get off at the Original Oak and Skyrack pub, have a pint, then walk 10 minutes to the ground. You can get the number 1 bus from Leeds train station, takes about 20 minutes. Other buses are the 28, 95, 97. There is a map outside Leeds Train station that shows you where the bus stops are.