I spent a few days in Siquijor this past August. I dove with Bahura and stayed with the attached resort Lazi Beach Club. It outside of the main touristy area. The owners of Bahura really helped with all of the small details. Which ferry to avoid from Duma, they even arranged a tricycle to pick me up at the pier and take me to the resort. Trike is 1000 pesos, and a van is 1500. Next time I would go with the van. One hour on a bumpy trike was a bit much. I opted for a fan room, but it was huge and only 10 meters from the beach. The resort is a bit isolated, but a short walk to a small sari sari shop if you want something from outside. I ate most of my meals at the resort. No complaints. I did order delivery once from Twenty4 cafe. The fish tacos were really good. Resort had no problem with outside food or drinks.
I was the only diver for my three days (10 dives) and it was not a problem. Most of the dives are shore dives. If there are more than three divers then no extra charge for a boat. My DM Rocky was great. Safety procedures were well followed. The O2 tank, first aid kit was always identified and made sure aboard before we left. Only one dive was less than 60 minutes and all were no deco. We had a mix of reef and muck sites. Notable things we saw: mimic octopus, ribbon eels, seahorses, frogfish, nudibranchs (tons), ornate ghost pipe fish, more turtles than I could count.