This is my first time to Paris and I have no idea what the best way is to get to our hotel.. Should I ask the hotel if they have a shuttle? Or hire a shuttle? We land on September 26th so I am trying to figure everything out before then. Thank you in advance for any help and recommendations!!!!
A taxi would be better than a shuttle.
If you want to use light rail and subway, re-ask the question.
The Air France Les Cars bus goes to Porte de Maillot, which is about 100 yards from the Hyatt Etoile, right behind the Palais des Congres de Paris, which faces on the north side of the Porte de Maillot traffic circle. "Etoile" is a bit misleading, as it is a ways from the Arc de Triomphe on the Etoile, but close enough to satisfy the advertising department.
The website of your Paris hotel likely has "getting to us" information, often under the heading "Location".
Under the Hotels Fact Sheet it states that they have direct Air France Shuttles to and from the hotel/CDG, http://parisetoile.regency.hyatt.com/content/dam/PropertyWebsites/regency/parhr/Documents/en/Hyatt-Regency-Paris-Etoile-Fact-Sheet-EN.pdf, you may want to contact the hotel if this is at a cost or free. If they are using Air France's Les Cars, then its just over 16 Euros one-way per person. http://en.lescarsairfrance.com
Other than a taxi or RER/Metro there are shuttle services.
Paris Shuttle, http://www.paris-shuttle.com, which I am using next month from hotel to CDG.
Super Shuttle, http://www.supershuttle.com/Locations/CDGAirportShuttleParis.aspx, like we have in the states.
Listen to Sam! Cars AirFrance!!