re: Recommend me some places to travel alone.

I do a lot of solo travel. It's great!!

I've been to Costa Rica alone. I highly recommend it. I hired a personal driver (cheaper than a rental car and WAY safer) and went to arenal, Guanacaste And Manuel Antonio. Missed out on on Limon. It was an amazing trip and my driver is also a guide and new all of the local places to go to.

I just got back from a Germany and Austria solo trip. Thats probably not for everyone, but I highly enjoyed it.

Alberta Canada is another recommendation. That's a long involved post though. If you're not interested in Alberta then I won't burden you with details.