We are doing the Channel Islands sometime this summer. Doing a long weekend trip to do some diving.
I'd suggest doing the advanced class before your trip so you get your first exposure to some new experiences in a training environment before doing it with a buddy on the trip. I think this mix of intro dives is the most rewarding for the advanced class:
- Boat
- Deep
- Night
- Navigation
- Peak Buoyancy control
On a Channel Islands trip:
- You will be doing a giant stride from about 6 feet in the air...having done it on a Monterey charter first will be a good intro.
- At Breakwater you probably didn't go much deeper than 30 feet. On a CI trip you will have the opportunity to go deeper than that.
- You will have the opportunity to do night dives...which are awesome.
- The compass is an amazing device that will help you get near the boat before surfacing.
- The better your buoyancy, the more relaxed you will be.
Overall, you want to limit the number of 'firsts' that you have to deal with outside of training.
FWIW my favorite CI charter is the Horizon out of San Diego.
When possible, continue your training to Rescue Diver. My opinion is everyone should at least be rescue trained.