So the first thing I thought about was teleportation, if I only could have one superpower. So I agree with @Shannonl5, about being like Nightcrawler.
So I stated what I would want to do with my powers below ⬇️
1) Travel the World
If I had the ability to teleport I would visit my best friends, who live in foreign countries (mainly my BFF). Moreover I would go all over the world without paying for a single plane ticket.
Some places I would travel to would be
A) Ireland - It is the most haunted country in the world, basically explains itself.