What dive sites do people recommend there? Is there night diving there?
Besides the shore dives that were mentioned - some of the charter dives that are pretty good for OW level divers would include (IMHO): Sweepstakes, Wetmore and Carolina Rose. As for a night dive - beisdes the shore dive, I know I have dove with Steve on the Sweepstakes at night, however they will take you out to just about any wreck for a night dive if you are interested (biggest issue is filling the boat for some of the longer trips)
I don't mean to hijack this thread.
I have a question for you folks that have been to Tobermory.
Do the wreck have mooring buoys? How do the diver operators up there get one the wreck?
One of my dive buddies has a boat that trailer where ever we can and not deal with dive operators.
Most of the popular dive sites in the park as well as those outside usually have bouy's (some even have multiple bouy's). The bouy's are set up so that boats can tie up to them and for the most part the operators are pretty good with allowing each other to raft off each other - not sure how they would respond to a private boat.
On some of the lesser dove wrecks, there are usually private bouys put up. I believe most of these can be used by everyone, but at times they can be harder to find (I remember a trip where it took over 45 mins to find the Newago).
As mentioned already, there are restrictions for when you can dive on the Sweepstakes and I there are some requirements about a permit for having a boat up there. Not sure on the cost - if you google Fathom Five Marine Park, I would think you should be able to get a lot of info about what is required.
That said, I would strongly caution you or your friend about taking a private boat up there, especially if you are not familiar with the area. If you dive on some of the wrecks, you will appreciate just how destructive the conditions can be up there with regards to both the weather and the very unforgiving rocks. Every year, there are at least a couple of ships that still wreck up there (Steve at Aquasports has a pretty good side business of salvage). But, if you are going to - make sure you have good charts and navigation equipment (as well as a radio).