Need to call the Nick Hotel, because their policy is that they won't let anyone in, that is not staying at the hotel, just to meet Dora The Explorer, without paying the stay. Some has reported they where allowed to tour the hotel without staying, but I call first to make sure!
Just in case you didn't know, you can meet Dora at Universal Studios. We saw her there on our visit in September. DS (3) loves her so, of course, we had to get a picture