21. On the far East Main Road North and East of Castelletto.
22. On a walkway directly East of Castelletto (near the sea)
23. In farm field Southwest of Horizon Festival.
24. Between a house and outbuilding Northwest of Horizon Festival.
25. Behind the Farm House North and West of Horizon Festival near Speed Camera.
Here is where you will unlock the Achievement: Summer Sale (10G) Smash 25 Reward Boards.
26. Under a covered walkway in Eastern Nice.
27. Next to a farmhouse on the Dirt Road to the Northeast of Horizon Festival (Bugged / No Flag)
This sign may be bugged for you - it was for us. That means it will not show as an icon on the map and, when you hit it you may not get credit for it. We are told by Turn 10 that this will be addressed in an update.
UPDATE: It turns out that the video above - for the "bugged" 1K Bonus Board is NOT actually a bugged board so much as a board that is not supposed to be there... And because it is not supposed to be there, it does not count in the collection!
The actual CORRECT location for 1K Bonus Board Number 27 is in the video above - and is located just off the road South of the Horizon Festival - we only realized this when we were doing the 7,500 XP Boards. So you CAN complete the 1K Bonus Board Collection after all!
28. Zona Industriale on the Dry Riverbed along the south side.
29. Top right corner of the map on the right-middle side of the lake, on the shore.
30. Up a ramp in a parking area near buildings directly East of “CASTELLETO” on the map.