Mount Field National Park in southern Tasmania encompasses a range of habitats from temperate rainforest to alpine heathland.
The lower elevations are dominated by temperate rainforest, and there's a popular waterfall walk that meanders through this area. There's a gravel road that provides access to the upper elevations, with a carpark at Lake Dobson., and walking tracks beyond that to access the alpine regions. The road is usually in pretty good condition, although there are typically some short sections where potholes need to be negotiated, and it may be closed or impassable in winter.
See the official park web page for more information about the park.