Look at
http://www.rockingham.wa.gov.au/bent.pdf - there is a map and questionairre
That will be a big change to the foreshore - looks as though you loose a lot of the park - looks as though the proposal is for a carpark from Bent Street to Hawker Street and another carpark at Berry Street.
I only get down to sail at Rockingham occassionally (an alternative to visiting the mother in law) - it will be a shame to loose the grassed area - good luck with your action.
I suggest that you make your feelings heard to the council and to Maunsell (Jo Buckee - 9281 6144 0407 433 472). I have informed Jo of this thread -
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=1243 - so have a look at the plan and put your two bobs worth in.
Good Luck
Radmac