The part of Heath Park near the new bike bridge has some lovely native saltmarsh plants growing beside the mangroves. You'll find marine couch and succulent plants like seablite and ruby saltbush, along with warrigal greens. In wetter spots there are sedges like bunchy sedge or a smaller sedge called "dirty dora"!
It's a great place to do a bit of weeding because of the number of little birds (fairy-wrens, mangrove gerygones) that pop their heads out of the mangroves and hang out in the native shrubs. The saltwater coming up the creek with the tide helps keep the weeds down as it favours the salt-tolerant plants. They just need a little encouragement and space.
Across the new bike bridge there is a large expanse of marine couch which creates a wonderful open space as an antidote to busy Lytton Road.