how much would a DM cost? since im going to be diving alone(im the only person in my family who dives) and im going to be there in the start of august.
The Peace offers a guide for $125 (https://www.peacescubastore.com/ProductDeta...oductCode=GUIDE). Not sure about the other boats. If you get a guide through the local stores, it'll be a bit more since you'll have to cover the DM and the DM's trip cost. If you are comfortable diving and have done some cold water dives before, I suggest asking the DM on the boat to find a buddy for you during the briefing held before each dive. In my experience there are always a couple solo divers willing to pair up. If you've never done a cold water dive before, yes, get a DM at least for the first trip.
Another option is to sign up for a class and you'll get an instructor in the water with you, you'll learn something new and the gear is sometimes included (depending on the shop). Good options would be Nitrox or dry suit diving. If you are staying past 9/29/12 (Lobster season opens), take a lobster hunting class and have dinner as well
. There are a number of good dive shops in the area. I am partial to Malibu Divers (www.malibudivers.com) since I work for them
. Lastly, you could do a guided beach check out dive and then go on the boat.
As for dive sites. Like for other folks here, San Miguel is my favorite, but it is advanced diving and definitely on the cold side (40-50F). Not a lot of boats run out there since it is a 7 hr trip from Ventrua (one way). Anacapa has had marine protected areas for a long time and has a lot of great sites (Cathedral cove with lot so kelp, Underwater arch with lots of sea lions, Underwater island for a small wall to name some of my favorites). If you take a boat from San Pedro/Long Beach you can go to Catalina island, which often offers a little bit of better viz. And if you have time, take a road trip down to San Diego to dive the Yukon and Ruby E, two really nice wrecks.