Any recommendations for a decent salon for a Facial, manicure, pedicure for a male?

When I saw your thread title I thought it was going to be an interesting question about Bangkok Airways, their airline code being PG . :)

Assuming you're staying in a hotel in a business/tourist/central location, there will be at least five establishments offering these services within a five minute walk. What is your approximate location?

I will be staying at the Amari in Sukhumvit.

Amari Boulevard, Soi 5? If so, plenty of salons in the neighborhood. Get out for a walk, maybe up Soi 5, back down. Then up/down Sukhumvit a bit. You'll pass ~ 20 salons. You can find higher-end salons in malls, hotel complexes and shopping centers. At the corner of Sukhumvit and Soi 3 there is a large shopping center, called Nana Square. There are some decent salons in there. A little farther west (away from your hotel) on the opposite side of Sukhumvit, near the JW Marriott is another office/shopping complex. There is a at least one salon in there.