Mate you are in Sydney
take her camping - well actually glamping at the lane cove national park or do the glamping at taronga zoo. All set up and all you need to do is bring yourselves along. Nothing funnier than trying to go to sleep with a elephant trumpeting a a lion calling. hmm maybe not a good idea but a few wines and you'll sleep soundly. The other glamping site is cockatoo island and wake up to Sydney Harbour coming alive and they have afirepit area at night. A google should find em.
150w is going to attract every moth and bug in NSW and peeve off others next to you.. Keep it simple and crash early and wake up early unless it is a place where you can sit by a fire and watch the stars go by. You only need a small led lantern for the 2 of you and a torch to get to the amenities. .