Verified answer

There is a daily bus leaving from the Louvre at 8:45 am, next to the tourist office. You should actually go to the tourist office the day before to book your ticket and so they can explain to you in English where to take the bus. http://en.parisinfo.com/our-welcome-centres/guide/...

It's 19 € round trip.

Otherwise take RER B to CDG airport and there will be a special bus to Parc Astérix there leaving every 30 minutes. The bus costs 6.90 € round trip and a 5-zone Mobilis pass to get to and from the airport costs 12.90 €.

As far as being worth it, it depends what you like. It costs 39 € so the whole day will be pretty expensive but you should ask about the combo specials including transportation and admission.

I personally think it's the best theme park because I grew up reading the Asterix the Gaul comics (which most Americans haven't heard of) and I think the rides are good, but that's me. People have different tastes and expectations.

I think I can break it down for you.. because I know the Montmartre area real well.. But just a warning, its from what I can remember, and also, from the destination Im writing from is the Montmartre Boulevard.

And this is by car by the way...

SO first, go on the ramp(turn right) on St Denis/Lille, merge into Boulevard Peripherique. Keep driving until you see the exit for St Denis/Bruxelles/Lille/A1. (EXIT HERE) Merge into the L'autoroute du N. Partial (its like a toll road)

From there youll be able to see a sign that will direct you to the Parc Asterix parking...

I went there this past summer, and it was such a blast! Its almost as good as Disneyland, with plenty of fun rides, and also a fantastic dolphin show. Its definitely worth going, and I highly recommend that you go!!