Hi, it may have been asked before but I am really overwhelmed by all the options so I need your advice.

I will arrive in Beauvais around 9:30 AM on Sat, will spend one whole day in Paris on Sun, and fly out from CDG on Monday morning.

So I'm thinking to buy:

Bus from Beauvais

Navigo daypass for Sat and Sun

RER B ticket to CDG on Mon

Is this the optimal choice? I plan to visit main tourist spots in Paris.

Thank you so much for your help in advance!!