As with other things we have many choices when selecting a dive centre to dive with, so what can we look for. One of the things is the experience of the people running the dive centre, how long have they been in the industry for example. But this not necessarily mean ignore a newer dive centre as there may be very experienced people running it. They size is important! Not true as with a large dive centre you could get a great personal experience, or a feeling that you are ust one in a crowd depending on how things are organised. With a smaller dive centre you may not get as many choices but also get a very personal experience.
As with looking for accommodation when travelling, things like trip advisor, facebook and other social media etc can give you some indication, but as with all things on the internet you need to check from different angles and not just a single review or you may bite off more than you can chew! Sorry couldn't resist the rhyme! Look at what photos they publish, especially of everyday diving activities.
Flexibilty and timing are important when you are travelling so you can time your visit to fit in around your travel plans. So a choice of diving services is something to look for.
The main thing is to contact the dive centre and ask them for the things you want to do and when. When you do this be specific, in this way you wont just get a generic reply but a personal one.