If you're staying at the Disneyland Hotel, it'll be a longer walk to get to Downtown Disney. There was an entrance right outside of the hotel basically but that will be closed for construction. I doubt there will be a direct path because the construction site encompasses that entire side of Downtown which means you may have to go around to the other side and enter through the main entrance. I'm not sure but I go there pretty much every month. If I find more info I will post an update.
There's the shuttle . You'll be fine
The hotels are really close to Disneyland and im sure that they will have certain paths for guests to take to get into the parks. It also depends on what hotel you are staying at because some have entrances into the parks from the hotels
Thanks! Your answer is awaiting moderation.