Well, that's a six night trip compared to his seven nights, but a nice quote on travel and diving both. $63 per two tank dive, including taxes & fees, really? I hope your unnamed Op is paying their employees full wages & benefits and is not one of those skimping to charge less.
Fares out of Fresno actually look cheaper than out of Sacramento at the moment, as those fluctuate a lot, as do hotel deals. I think you did okay with your shopping. The lowest fares I see on Matrix on any dates in April from Fresno to Coz when I limit my travel time to 12 hours each way look like $681 each, and the best I see at Hot Coz with just breakfasts is $678, so about $2,040 for plane & hotel with breakfast. You got AI for two for $37/night more, which ain't bad. You'll get tired of AI food faster than you will the diving, but I've eaten all meals there for a week before when I was too cheap to get private taxis both ways to town, and it was ok.
When you book packages, it's usually be there or else so I hope you got Trip insurance just in case. Crap does happen and you can lose the whole trip if you have to cancel for unexpected reasons.
I hope neither of y'all bought airport transfers in your packages as those are usually marked up severely and cost twice as much as paying for the same airport van and return taxi if you pay then & there.