It's fine as long as you enjoy your own company. Though I would say maybe don't go to a non English speaking country alone. Just too lonely when you have trouble speaking to anyone.
I'm thinking of doing a mini-vacation to Tucson/Glendale next year (or maybe even somewhere else) to catch some games. Like a two to four day trip. Bf really doesn't want to go, so I'd be on my own. Seems fun, but I'm a shy person and I'm not sure how it would go.