Pretty sure those are simex trekker "tyres" which aren't sold in North america, I think. The forest looks pretty "jungly" also, so my guess is an asian country like Thailand, Malaysia, or possibly someplace in the South Pacific like Guam.
yes that is indeed a Philippine plate and the trail head looks very familiar i think i have been there before. if i am not mistaken its one of trails in Davao, southern part of PI.