Regarding shade, the Vibe encompasses the full width of the ship, so you can follow the shade to your liking.
Regarding "quiet place to relax", um, yes, the Vibe can be a library sometimes 😝, but during peak hours, it can get boisterous at and around the bar and hot tubs (thankfully). That said, you could likely find solace in some other corner of the Vibe.
Also, the Waterfront has tons of (free) comfortable seating in shaded areas than could become your home base for reading and chatting.