We have not stayed the night here, we too normally stop at the Radisson. However we tend to walk here for our breakfast because it is better than the Radisson breakfast and much cheaper. Here are the walking directions
To get to Bewleys use walkway to terminal 1. Go down the escalator when you see 'Welcome to terminal one' sign. Turn left and walk to the far end of check in desks. By the Thomas Cook sign there are 2 lifts, go down to level 1 (currently you are on level 5). Turn left out of lift (you are now outside) and head towards the building that has a sign 'Terminal 3 and an arrow pointing to this terminal'. From here there are blue signs showing the way to the hotels. It takes 10 minutes from the SAS Rad or 15 minutes from terminal 2.
I was 46 and my mother 73 last time we walked and find it easy to do. We will be doing the same on our November trip. I suppose if you have a lot of luggage you may need to use the mini bus supplied by the hotel.