The Studley Park Boathouse is almost like a step back in time, with a quaint little restaurant/cafe and ice-cream shop to sit at and have a bite to eat, as well as the gorgeous little paddle boats that are available for hire.
For a romantic date on a nice date, take your loved one for a ride on a paddle boat. They are relatively easy to use and you can paddle them down the river and look at all of the beautiful birds and greenery. A row boat for two will cost you $40 for the hour, with a refundable $20 deposit.
Afterwards have some food at the Boathouse restaurant or cook up a barbecue in the picnic area. There is also a pretty walking/bike track to walk off your lunch afterwards.