What type of exercise is good for people with marfan syndrome?

Non-strenguous: Marfan syndrome persons should avoid contact sports. If symptoms are on the moderate to severe side, they can participate in non-contact, non-strenguous activities such as golf, bowling, walking, yoga, or tai-chi. If mild to moderate in severity, they can try non-contact, moderately strenguous activities such as biking or swimming. The national Marfan foundation website is helpful.

Hard to say : Marfan syndrome is associated with aortic root dilation so those that have that should not do heavy resistance / weight lifting. It also is also with easily dislocated joints especially shoulder so some sports say football would not be a good idea. However these thing depend on what each individual expression of the syndrome is so consult with your doctor.