Hey mate,
Can’t help you launching from that area as I never have, but I can tell you St Helena is worth a stop and a walk. We had a very peaceful night there on the way back from Tangalooma when we went in October 2011. Moreton Island is fantastic, The wrecks, Sand hills etc, however it can be very uncomfortable. A gentle SouthEasterly is about the best time to be going over there I think. If you are going to go there, you may want to pack a tent etc, as if things are too bumpy you could leave the boat anchored behind the wrecks (if you can find enough room in December) and sleep ashore. In the right conditions, like my photos, a very memorable family holiday is assured. In the wrong conditions, you’re missus will probably not go on the boat again. Here’s that nice video of Northern Moreton bay in the wrong conditions:
http://www.youtube.com/watch?v=iGnPGxaWp4g
The lower bay to Gold Coast is a great option when it comes to a family who don’t like rough stuff! You could launch at Manly for a lower bay trip, or you could drive down to Horizon shores Marina which has a great sheltered ramp/pontoons, and for $20 you can use the ramp, leave the car and trailer there in relative safety (onsite Security) for as long as you want. This is a very central spot about 15 miles either way to Peel Island in the bay, or to the Gold Coast Seaway, however is remote out in the cain fields so no good for stocking up on food etc.
If sailing down from Manly, Peel Island, Horseshoe bay is fantastic except in a southerly. I’m told the small ships club at Dunwich is worth a stop and lunch, but there is deffinately not too much to see in the town of Dunwich (no offence to any Dunwichians reading).
If sailing down to the Gold Coast from Manly, the Canaipa passage is a little more interesting or you could go the Main passage ( a bit dull but quicker and a much easier sail if the conditions are right). Anchorages worth considering if you take the Canaipa route are "Blaksleys anchorage" and the all weather peaceful anchorages of "Canaipa point" and "Slipping Sands", which is near the southern end of North Stradbroke Island.
The best anchorages down there on South Stradbroke Island are Jumpinpin and The bedroom or Tipplers passage for a peaceful night. From there its only an hour or two sail to Southport. In Southport, the best anchorage is "Marine stadium" known locally as "Bums Bay" which is just north of Seaworld and usually packed. On the Northern or Western sides of Wavebreak Island are also nice. The Stink boats pack in real tight in the little hole behind Wavebreak but its a lovely spot with great views of the Gold Coast skyline. There is a nice little spot to anchor behind a small sand island (Harry’s Island I think it is) right out the front of the Seaworld Carpark, and we have had a good few days anchored there taking the kids to Seaworld each day. We also sometimes go down there and anchor, stern on the beach at the Southport parklands. This is great for younger kids like mine, however it is also handy to free showers, the pub, Australia Fair Shopping centre, and public transport down to Surfers or the Casino if you could be bothered. It’s also a good place to be on New Years Eve. Last year we were anchored right on the hundred metre exclusion zone for the fireworks barge - a great spot! You could drop the mast to go under the Southport bridge if you wanted to take the boat into Surfers.
The Beacon to Beacon is a must. Bias boating had a big sign up a while back, saying that there would be no more once they run out! Apparently, Cambell Newman has shut the Beacon to Beacon down so he can dump some more public servants. I don’t know if this this is true (they seemed to think it is), but I grabbed another copy just in case – The Beacon to Beacon is pure Gold for anyone cruising in this part of QLD and if anyone reading this is coming here, order yourself a copy while you can!!
Here are some reasonably accurate distances which may be useful on the bay.
Tangalooma to St Helena: 18nm
St Helena to Manly 4.5nm
Manly to Dunwich (South Straddie) 11nm
Tangalooma to Big Sand Hills 8.5nm
Big Sandhills to Horseshoe bay Peel Island: 17nm
Peel Island to Cabbage Tree point (main channel route): 15nm
Cabbage Tree Point to Wavebreak Island (Southport Seaway) 15ish nm
Caloundra to Bongaree (Coastal passage): 22nm
Bongaree to St Helena: 22nm
Bongaree to Manly: 26.5nm
Manly to Sandgate: 14nm
Mud Island to Big Sand Hills: 11nm
St Helena to Big Sand Hills: 10.5nm
Shorncliff to Tangaloooma: 17nm
Tangalooma to Bulwer: 7nm
Blakeslys Anchorage to Horseshoe bay: 5nm
Manly to Mud Island: 8nm
Manly to Horseshoe: 11.5nm
Manly to Brisbane City (up the Brisbane river) 24nm
The Wrecks Tangalooma

Big Sand Hills Moreton Island - much bigger than they look here and one hull of a climb! At 70 metres they are the highest sand hills in the world and the view is fantastic once you reach the top, as is the slide back down on any old election day corflute signs or real estate For sale signs.. Although you are in the middle of nowhere, remember that the beach is the road and 4x4ers do come by occasionally. My wife left my sons PDF at the base of the sandhills and sure enough, some 4x4ers stopped and nicked it while we were climbing up...

Off Big Sand Hills, about 3 metres depth
