I'm planning to head down to Sandringham beach
tonight, unless the weather suddenly turns nasty. Company is welcome :) We usually get there around 6pm, and swim for an hour or so, then grab some takeaway on the foreshore reserve at the top of the cliffs near the Bay Rd/Beach Rd intersection.
If you park at the carpark across from Tennyson St, its a couple of bucks until 8pm, usually by the time we get there the day time folks have headed off. From that carpark looking out to sea, on the left there's a path and then a ramp leading down to the beach. We're usually within about 10m of the end of the ramp.