I think there are 2 marinas within urangan boat harbour , the Great Sandy Straits marina. is on the northern end while the other is on the southern end. I can't think of the name of it but it is named on the Qld Trans chart as well as Beacon to beacon I think.
Some other good anchorages are Nth white cliffs ,Sth white cliffs , a few areas in the sheridan flats area are nice and can be isolated but watch depths and current (the tides from north and south meet here and can be a bit confusing in places),also Gary's anchorage is very popular spot with all round protection. Just south of Gary's against Fraser there are a couple of nice spots in a SE 'er opposite the 3 green beacons in a row, but I can't think of the name of the area ( sorry ,at home at the moment ,charts are on the boat.) .
Pelican bay at inslip point is good and if you go right in there is a pretty little beach in the south east corner. Again watch the depth. There are usually some crab pots around that may indicate the chanel and probably a few campers here as well.
A bit further south is T bar Ck. which is a bit of a favourite . If you continue up the creek past 2 large moorings (blue plastic 44 gal drums for the houseboats) and head diagonally across the creek towards the north bank there is a sandy beach with a deep spot in front which is nice .Beware of rocks out from the beach (marked on chart). West of here is a military training area and occaisionally at night there can be some tracer flying around in the distance. Kind of interesting....?
If you go to Tin Can Bay check out the yacht club on norman point at the entrance to snapper ck. near the boat ramp www.tcbyc.yachting.org.au
There is also a public jetty here next to the ramp with a 1 hour limit .
If you feel like a break from sailing (??????) ,Kingfisher bay resort on fraser has day facilities with a bar and bisto and pool open to anyone. Can be a bit expensive though. Beware of drying the boat out on the beach on the north side of the jetty as ther are many areas of coffee rock .The other side south of their watersports area looks a bit clearer.
Like you I sail a centreboarder so some of these spots are shallow . The charts are usually accurate as well as lucas' Cruising the CC.
As Bedouin said I don't think sharks are any more plentiful here ,than anywhere else. I haven't seen any, but then I don't catch any fish either.
hope this helps