I will be arriving at 8:30am at CDG, Term 2E, then scheduled to take a TGV at 3:40pm from CDG to the west. I plan to take the RER B to St. Michel/Notre Dame, then back to CDG in time for the TGV.
1. Is there a convenient luggage locker at Term 2E? How much?
2. How much travel time should I estimate to and from Notre Dame?
3. Conservatively I estimate about 3 hours actual sight-seeing time. Does this sound right?
4. Are there better sight-seeing options closer to CDG to pass the 7 hrs?