Here is a gallery of photos from around Mt Bogong and the Bogong High Plains. There are, of course, a million worthwhile hikes you can do in and around the Bogong High Plains. All of the tracks are very civilised, well marked and well maintained. If you have the time, I would recommend doing the "round trip". What I sometimes do is to leave the car at Harrietville, climb up Bungalow Spur to Feathertop and then south to Mt Hotham and from there down to Dibbin Hut at Cobungra Gap and then on to The Bogong High Plains. From there you do have some choices but I would normally cross the plain to Cope Hut, visit Wallace Hut and keep heading north to Mt Nelse and then Roper Hut and down to Big River. Here you do have to be a bit careful. There is a chain strung across Big River to help but it can be a difficult crossing if there has been a lot of rain or snow melt. Once you cross you head up to the big one - Mount Bogong. Victoria's tallest mountain. It's a long slog to the top but in no way difficult.
Again, there are a number of different ways to go but I would normally head down Quartz Ridge to get to Bogong Village. Cross Bogong High Plains Road and head up the range to Mt Fainter. Then just keep heading south (make sure you detour to visit The Jaithmathangs) until you get to the foot track that takes you down to the Kiewa River West Branch, passing Weston Hut and Blair Hut on the way. Then climb up Diamantina Spur and down the other side to end up back at Harrietville. Not that you have to start at Harrietville. I have started from Mt Beauty or even Mt Hotham in the past.
Sounds like a long hike and I suppose it is. Leave plenty of time to do all the many side trips and interesting detours along the way. But it really is pretty easy. Except in bad weather the way is usually very easy to follow. There are usually huts around in emergencies and nothing that difficult to climb or bash through.
The only exception is in winter (but keep in mind that snow and even full on blizzards can happen at any time of the year and you need to be prepared for that). In winter it can be very unforgiving and even with snow poles to help, navigation can be difficult and the going slow and difficult.