I just got back from 4 weeks in Bonaire. I did this dive 8 years ago and it is still very enjoyable. I did it this time with my wife. She has just 40 dives, all in Bonaire, and did her open water and advanced here-- no problem! I do not think you need a guide as long as you have enough experience. It will take you 40 to 45' to reach Karpata. I never had any current. The wall is impressive, and you can go as deep as 40-45m. I would really recommend this dive to anyone who wishes to have an unforgettable dive.