From Surawong go down Soi Thantawan, opposite the Tawana Ramada Hotel, past Tawan Bar and turn first right (at the corner where you see the Mango Tree Restaurant). Pass Solid and Golden Cock on your left and Nature Boy is about 200m on your right. I won't say you cannot miss it.... it's quite narrow
If the management enforce these new 'rules' there is the possibility that those who have patronised the place in the past will cease to do so. Fewer customers will result in lower takings....