My wife and I are new to diving but have been loving it. So far we have only done lake dives and some shore dives but we're interested in doing some boat diving. We've got out own gear and each have a tank. I've been looking at some boat diving operations and they're all different. Some offer free tanks and weights, free air fills, food, whatever. Which options do you like to have when you take a dive boat? Would the free air fills cover us each taking one tank and then having it refilled when we surfaced or would we have to rent another one? FYI this is for California diving. Thanks for the input!