This is an easy walk that is only about 11 or 12 km long and visits a number of the highpoints (both literally and figuratively) of the Wonderland Range. Start either behind the caravan park in Halls Gap or through the Botanic Gardens, and follow the steps (many, many steps) up to Mackeys (Cherub) Peak. If you're old, you can probably blow past a few 20 and 30 somethings who are staggering along the track with shopping bags and cameras held out on poles to snap narcissistic pictures of themselves.
In not too long, you meet the track that comes up from the Wonderland car park and the hordes of people who have managed to stagger up this way, also carrying shopping bags. I had no idea shopping bags had replaced backpacks. Stroll along the track towards Bellfield Peak. There are some good overhanging rock formations perfect for a few pull-ups or ankles to bar (rock formation) as you walk past.
Instead of taking the shortest route down to the Sundial parking lot, you can take a slightly longer loop out to Lakeview Lookout where you may find some dubious abseiling going on. Beyond Sundial carpark, you'll leave the crowds behind as you stroll up to Sundial Peak where there is a sundial (and a view), then wander down the track passing one more lookout and following a curving ridge down to Lake Bellfield. Be back in time for lunch.