Bus schedules can be checked at Bussireisid.
If you don't like the summer crowds on Pärnu Beach then Valgeranna is the place for you. It has 500m of fine white sand at the edge of a beautiful pine tree forest.
It's a good location for swimming, sailing, sunbathing, playing beach volleyball and football or golfing.
The official Estonian tourism website provides an extensive list of options for accommodation in Valgeranna.