i did this in Cornwall this summer,..
but we had a windbreak set up,.......i tied the tarp guys on the poles at the base of the windbreak (on the outside) and adjusted the them to slightly overlap the "wall",..
then on extendable 6-7 foot bivvi pole out in front gave a proper shelter for the girlies to natter under out of the rain while we played in the surf,..
waaay better than the one man halfords beach shelter we had,....
just a thought mate,..
12 of us spent nearly a month touring a different beach everyday and staying on it until the sun set,...and learnt quite a lot from doing it,....
we became proper beach tramps,....out of the month we had i think i had shoes on for about an hour a day,..now thats the sign of a good time in my book,..
people passing never failed to coment on our set up,....
got some improvements for planned for next year too,....and it all packs into a day sack each ,....(not counting the beer coolbox and windbreak)
i hope your beach dwelling is as enjoyable as mine was,....
cheers
Stu,....