James F.
Yelp
Located about 5km from Hornsby or 25km from Sydney, this has got to be one of the best National Parks on offer. There is not much that you can not do here no matter your interest. If you are after camping, picnic areas, hiking, bike riding, BBQ areas, canoeing, fishing, swimming, or even boating/sailing, then this is the place for you to head to when you get a spare day.
I say day as to make the trip here worthwhile, that is about how much time it will require. Besides that, as entry to the park is not free, if you are after your money's worth, you should try and stick around a bit.
While the obvious fee is the $11/car ticket machines you see everywhere, the website goes into a little bit more detail. While I have not yet had to pay anything more than the $11 before, the details of potential other charges from the website include:
Daily entry fees: if you're arriving by bus or car and walking or cycling to The Basin you'll need to pay daily entry fees of $4 adults, $2 children (pre-booked groups) or $4.40 adults, $2.20 children (groups without a booking); there is no daily entry fee for teachers/educational supervisors (1 adult per 10 children).
Also, while I added an approximate opening and closing time for the gates to Yelp, different gates have different opening and closing times depending on the time of year. Thus...
Gates to Bobbin Head and Appletree Bay are closed from 8pm to 6am during daylight savings periods, and 5.30pm to 6am at other times of the year. Gates to West Head are closed from 8.30pm to 6am during daylight savings periods, and 6pm to 6am at other times of the year.
In this park, vehicle entry fees are $11 per vehicle per day.
Be sure to check this park out if you have the chance as it really is stunning. Best of all, the Bobbin Inn actually has half decent coffee and breaky on offer (review http://frid.co/smNIYr ) so you might want to start your day there... :-)