Grindr and Hornet are the BEST ways to meet locals when abroad. Change your profile to say "visiting" and see if you can get someone to show you around town. Also, while Grindr is huge in the States, Hornet is more popular (i.e. has more users) in a number of foreign countries like Brazil, France, Turkey, Thailand, and Taiwan. So you might have more luck meeting guys using Hornet while abroad.