For Tuesday, with tide coming IN all day best spots are SOUTH of the seaway, for flatwater. (the best spots are actually north, but what can you do about the moon?)
i.e. The Train which is at the end of North Street, Southport:
www.google.com.au:443/maps?f=q&source=s_q&hl=en&geocode&q=North+St,+southport,+qld&aq&sll=-27.956273,153.415275&sspn=0.026801,0.043516&ie=UTF8&hq&hnear=North+St,+Gold+Coast+Queensland+4215&ll=-27.950587,153.41888&spn=0.026802,0.043516&z=15I'm going flatwater myself tomorrow but I'm probably going to go to The Grand (hotel) which is about 1.5 clicks north on that map. It's a short run along a bank, in a channel... damn it, and is the main launching area for jet-skis. Sigh. That said I really like it for it's gybe-blast-gybe fun factor.
Hmm, on second thought I might go to The Train. But launch from Leonrd Fox Park (KFC) just further north. I'm a sucker for nice rigging areas. Dunno, I'll flip a coin or something.
The problem with The Broadwater on a public holiday is the 10,000,000 boats that come out, although that said it looks rainy and windy tomorrow, and they don't like the wind. Honestly if it's windy enough you'll be lucky to see a dozen boats.
P.S. The wind is looking very good for tomorrow

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