Have you ever done a regular cruise? I thought I'd be bored, and not particularly interested in "cruise culture," but the two I've taken (Alaska and Valparaiso around the Horn to BsAs) were great. You really can get off to yourself as much as you want and read or relax; food is easily available, and the whole thing is fairly economical. You can take or leave the social aspects as you choose. These days, there's no need to "dress for dinner", etc.