I'm a massage fan! Massages are great. The imporant thing is to communicate with your masseuse. You're the client, so if you're ever not comfortable (too hot, too cold, feeling weirded out) tell them so they can adjust things. Are you going to a spa, or seeing an RMT? Either way, you will be covered with a sheet. Whether or not you leave your undergarments on is your preference.
Not a manicure fan, as my hands get bashed up with physical labour. I did have French manicured acryllic nails a few years ago, but gave those up because they would break as I laced up my hockey skates.