Hello
Work in the company called City Bike and we have been organising bike tours for 20 years already.
Shortest route with little draffic:
https://maps.google.com/maps/ms?msid=20 ... 9,4.938354
The end of this map made some tricks but idea should be clear.
Wild camping is Ok to do, choose RMK or Riigimetsa areas to avoid any problems with land owners.
Dedicated camp sites are usually alongside forest roads and walking trails, some free are listed at RMK (State forest management) site:
http://loodusegakoos.ee/kuhuminna/voima ... aa#tulemus
I would get the proper map or GPS gordinates and go for it.
My suggested route, after Pärnu
From Raeküla district make turn to Sindi (big sunction and signs)
take a bike road, until Sindi and cycle through small sleepy down.
Continue alongside same road, until Tori, small village, places for snack and shop.
Cross the bridge.
A bit on a bigger road but big enough shoulder (15-16 km) and then turn off to left, sign to Rapla 53 km.
And basically follow the same road.
From Rapla road to Kohila, then to Saku and then already bicycle line almost to the Tallinn.
I believe best option for camping and other accommodations to find is Delfi:
http://kaart.otsing.delfi.ee/
Choose Kaardikihid
Choose majutus
Zoom the map until the symbols are active and then choose Kämping/telkimisplats and volaa
And use Google Street view, that good in Estonia and you will get ideas about roads, places and sights.
Good planning!