What dives did you do during your advanced course?
Any that you really enjoyed?
My choices would be Night, Nav and Rescue, as others have said here rescue is a great course.
Well my advanced course broke every standard I guess. My teacher told there not much he can teach me more.
The buoyancy dives (2) were very good, I reduced from 6 kg to 3-4 (tropic, shorty). A lot exercises, head down, upside down, 90 degree, full tank empty tank.
I made the Nav as a solo dive with bad vis, very interesting, but I still don't fell good on nav. Also on land I have no idea......
Deep was 5-8 meter. just at that time my old mother was on holidays here. the teacher was on the beach. She came and asked if everything right. He told I should have come to surface 10 min ago, but sooner or later the waves bring everyone back to beach. (my mother has high blood pressure, so not a nice joke)
I asked in the shop if there is a nav specialty and he told there is no book about it (not answering if there is a course)
Deep no problem: in Croatia: that wrack is on 55 meter no problem..... I didn't do that, but the pre-test at 40 meter but just to cold when I came from Thailand and there it had 15 degree in the water.
Well thats my experiences. With a few accidents due to bad serviced equipment (I have now a long time own equipment)