I like .travel extension, and generally travel industry domains, both geo and not, but I have to admit, it's a very narrow niche (dot travel), you really need to have only 1 quality word before it, in order to sell.
I sold pattaya.travel here on NameProst for $110 (only!), for example.
99% of major destinations, countries and cities are taken for this extension.
ElSalvador.travel won't work, because the country is considered one of the most dangerous destinations for tourism in recent years, on top there is an article (''El'')
Turkish.travel - like, for Turkish people? Won't work.
Make a list of cities, resorts and destinations and check them out in bulk, if you like this extension.
But also be aware that annual charges for this tld is much higher than of .com.
Good luck!