With no offroad experience behind me, i've done that same set of roads on my 1150 pig a few times and had no dramas, even with a pillion. If you leave Richmond as planned at 9ish and scoot up to bilpin/mountain lagoon, you would cover all your proposed ride by about lunch/cold drink time or so. As always on dirt i drop the tyre press at least 10psi each end and back off the rebound damping, makes a world of difference. Being a weekend i would caution you to the high probability of over enthusiastic 4wd's posing some serious pucker factor moments. As to the 18th i'll be involved in my occasional employment, i know where i'd rather be. Have fun, ride smart.