Not to put a wrench in your plans, but due to wind direction and suspended particulate in the water most people find they can't plan a beach dive in advance. It's one of those things that is best set up the night before, or even the day of. A 'Singles' dive off of a cattle boat could be planned because you'll generally get below the crappy vis with those. With the beach dive, however, the vis can be really bad. When it gets that bad I used to try to convince whomever my diving buddy at the moment was to swim the LONG distance out to the +20 foot ledge (usually worked to get under the bad stuff and away from the beach sands).
I think that the first beach dive I ever tried to do was a planned dive (a few days in advance). We ended up never entering the water due to conditions, and eating breakfast at a local diner instead.
Pick a back-up go-to diner and your planning will be complete.