I've read that in Jan - Mar, DLP typically runs a "kids free" (with paying parent) promotion. We are starting to plan a trip for Mar, 04. We will be renting a flat in Paris for a week - since they rent by the week and we only have a week and want to go to DLP on a week day, we won't really be able to stay at one of the on-site hotels. Do they do the "kids free" deal when you buy tickets only, or just on room + ticket packages? When do they typically start advertising/offering the "kids free" promotion? Also, since the I've heard that the weather can be pretty cold and wet in Paris in March, my plan is to play it by ear and go on the day that the weather seems the nicest. Is it possible to buy a one day ticket in advance for an unknown day?