I'm off for a trip there late July. Staying at Kubu, just up the road from Tulamben, I intend to dive most days either on the coral gardens at Kubu or around Tulamben.
I picked a resort with great rankings on Trip Advisor. It has spa stuff for my travelling mate who doesn't dive.
I have done 40 dives in the last 18 months, but am very new, and not a naturally confident diver. Selected Tulamben area after reading and talking to others, as suitable for a newbie who wants to look at great stuff, while diving over and over to gain experience, familiarity, skill improvement, without the additional task loading of strong current etc...
Meanwhile, I am swimming to improve my fitness...