Aruba operates a public bus company called Arubus.
To be honest, we have never taken the bus. There is a bus route that passes right near Treasure Palms on Caya Frans Figaroa (Route 2) but it’s not clear where the bus stops are located.
If you walk down to the Marriott or Ritz hotels, there is a clearly indicated bus stop where you can catch the L10A that travels in between Oranjestad and Arashi Beach and the L10B that travels between the Marriott Hotel and Oranjestad.
The bus fare is currently (2025) $2.90 USD or 4.50 AFL. Return trip and day passes. Passes can be purchased at the Bus terminus in Oranjestad or in some of the hotels, the Holiday Inn being the closest to Treasure Palms.