A nice quick little loop is out the road heading towards Tolangi (St Leonards Rd- opposite Dons Road) , head to Donnelly's weir by turning right into Donnelly's Weir Road, there is a shallow river crossing (or take the footbridge) and double back along the aquaduct to Marrondah Dam , along the Dam Wall back down through the Melbourne water park and climb backup to the Highway back into Healesville. Very quick (about 30min), but there are some options along the way to head into the hills along well defined tracks. Nice little ride I used to do each lunchtime.