I'd have to say that my favourite of the bunch was Wynwood, which comprised of an extensive tasting (complete with cheese and crackers). The Lime Blossom Verdelho and Cherry Blossom Moscato were absolutely divine and none of the options overly expensive; averaging around $20-25 a bottle.
All of the wineries offer group tastings, private tastings and functions, which are all easily booked either online or by phone. Information on all wineries and Hunter Valley activities can be found here.
An important note for all port-lovers, Drayton's has some of the cheapest port available in the wine country - only $15 for 2 litres. Or if bulk buying is your kind of deal - $70 for a 10.5 L drum. Plus their tour and private tasting is only $2 per person!
Lindemans was also a standout winery in that the correct procedure for assessing wine quality was taught. After visiting this little gem you'll be able to stun and impress your friends by swirling your wine and aspirating it in a fancy fashion. Even if you have no idea whether the wine is good or bad your technique will be flawless.
At the end of the day, a visit to the wineries of the Hunter Valley has left me cultured, more knowledgeable about wine, a little bit pretentious and pleasantly intoxicated. A great weekend getaway for couples or groups of any size.