"Spa Day is not a big add-on for The Sims 4 in terms of new interactions (the new skill, Wellness is a bit "meh") but adds to the game plenty of objects that are great to have in your sims homes (bath tubs, saunas, massage tables, a yoga mat...) + nice outfits if you like yoga and sports way of life."
"The sims spa day is an extra game pack for your sims 4 game. This will just give you another world to play in, with new clothes, people and new adventures to look forward to. You get to relax in the spa and also do some yoga, perfect relaxing game."
"Another big expansion pack for a game with many expansion packs already. Completely optional content but if you enjoy the game like I do you will get some benefit out of having this."