I believe Australia is ranked 8th on coastline size, plenty of nice unspoilt and remote beaches and nice climate. Up the top of Australia they have a lot of nasties in the water, crocs, deadly jellifish, sharks, so unswimmable really, climate is tropical all year.
As long as not Pakistan https://www.indiatoday.in/world/story/pakistan-hiv-outbreak-resurfaces-in-sindh-1613331-2019-10-28
It doesn't take that much money to travel the world. In fact traveling the world is most likely less expensive than your current lifestyle if you live in a western country...