If seeing the sights is on your list of things to do, head to Wild Boars Academy Team View Point— just one of the landmarks located 4.5 mi (7.2 km) from central Mae Sai.
Doi Sa Ngo is just one of the landmarks located 6.2 mi (9.9 km) from central Chiang Saen, so you might want to stop by for a few pics during your trip.
If museums are on your list of things to see in Sop Ruak, then you might want to head to Hall of Opium. If you want to experience more of the culture Sop Ruak has to offer, head to Golden Triangle Viewpoint, Golden Triangle Park, and Doi Sa Ngo.