Engaged while in Hawaii

So I’ve been in Hawaii for the past 4 days and yesterday my boyfriend popped the question, now he did it and none of our friends or family know because I’m about to be in bootcamp for awhile and he wanted to do it at the graduation. He picked this ring for it to look like a promise ring while around our friends and family so that they don’t suspect anything because they are judgy as can be but I didn’t know what to do when he popped the question but ask if he was really joking. Now after the graduation he said there’s gonna be a different ring and do it in front of all friends and family.