I have read numerous posts and websites explaining all of the options and I am more confused than when I started. We are on a budget and I am hoping that someone can advise what is the most cost effective option for us based on our planned metro usage.
There are 4 of us and we will be in Paris for 3 days staying in zone 1 near the Grands Boulevard station. We will take the RER upon arrival from CDG to Chatelet-Les Halles and on another day to Versailles and the metro to Gare de Lyon the day we depart. Depending on our energy levels, I can imagine we would take at least 2-4 metro rides daily to or from places in zone 1 and 2 on each of the 3 days. One of these days we would be traveling on the RER from CDG and another going out to Versailles.
I don't know if we should buy a 1 or 2 day pass on the days we will be traveling on the RER from zones 4 or 5 and riding the metro within zones 1 and 2. Or should we just buy books of 10 tickets for zones 1 and 2 and buy individual tickets for the RER? Or is there another option that would be more cost effective?