The walk shouldn't take any longer than 20 mins to complete.
At each stage you will find a colourful sticker. Find the sticker, match the picture with the description and replace with the appropriate number. A mirror (or knee pads) may come in handy at stage 3 
Stage 1 answer = A. On road sign. Yoda 7=A. Minion 8=A. Buzz Lightyear 9=A.
Stage 2 answer = B. On No feeding sign. Bus 0=B. Car 1=B. Train 2=B.
Stage 3 answer = C. Under bench. Star 7=C. Moon 8=C. Sun 9=C.
Stage 4 answer = D. Back sign. Woof 3=D. Meow 4=D. Tweet 5=D.
Stage 5 answer = E. Side grey box. Robot 3=E. Doll 4=E. Bike 5=E.
Cache can be found at N55 50.ABC W004 23.DE9