Is going on a cruise suitable for a 25yr old female?

Thinking of taking a 9 day cruise from Sydney. Other wise, what other trip would be good within Australia, besides Cairns. Thanks|||Hell yes. Go and have a great time. Before you go, watch 'Muriel's Wedding', important information concerning Karaoke. Good luck.|||Its certainly is! But if you are going by yourself, remember that the price you see is based on double occupancy. If you are the only one in the room, you have to pay an extra charge, which depends on the cruise line. It could be as high as 90% extra.