Philippines has some great scuba diving! Cambodia would need it more,( would be my guess), but do what you can that works for you. A farm would be a great haven to rescue animals.Best of luck with whatever you decide. I love the fact that thailand lets animals free. America calls it humane to cage them up and euthanize them! The world belings to all.
That would be about the price. I dont know why people chime in if they arent going to answer the mans question!?! Most of the answers are NOT what he asked.
You enter with a passport. You wont be coming in any capacity without a valid pasport with 6 months and depending on that passport, you may need a visa.