I'm planning to visit (8D/7N) Switzerland and Paris in June 2017.. I'll be going to Lucern from Paris..Please suggest which pass would be best for me
The best pass depends on all of your travel plans combined, so including day trips from Lucerne and Paris, and including your outbound trip from Lucerne. Once you have a list of plans you can find the best pass as explained here.
In general I can say that an 8-day Swiss Travel Pass might be a very good option. If you have one, you only need a ticket from Paris to Basel (Swiss border), as the Basel - Lucerne leg is covered by the pass. The Tell-Pass could work if you only plan to do local trips.
Please see the above links and feel free to let me know if any questions remain.
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