I just finished my O/W and had a really awesome instructor! We actually tipped him a hundred dollars cash before we were done with the class. Then once it was time for our open water dives, we were supposed to go out on a boat at the lake. Well the boat was full, so we suggested a road trip. Instructor was more than willing(we really had to twist his arm lol). We footed the whole bill, not just as a tip but for the security of having him with us. Was an awesome trip. I'll be posting a report shortly. I reccommend him to anyone I talk to about scuba, and am in the process of sending a letter to the local diveshop. This guy is awesome, and he did a phenominal job with out 11 yr old nephew. We actually got more than an instructor we got a good friend out of this, so it worked out as a tip not only for him but us as well
Brian