Hi, your son has recent undergone surgery of aneursym but you have not mentioned about were there any smaller aneurysm left. Some patients can have multiple aneursyms and very smaller ones are left alone and angiograms are done at regular intervals to see whether they are increasing in size. So in your son case its not advised to go for a roller coster ride or any activity which may increase the blood pressure. He may require another angiogram after few weeks to know the status of recently operated aneurysm and to see any new ones are noted. Wish your son good luck.