You definitely need some sort of a mobile app - people usually don't think about their travel much before they actually go. But once on the road they will be more inclined to check your info.
Data romaing charges abroad are massive, and your target audience are travellers.
I think it is a little premature for a mobile app as there are a lot of kinks to still get through on the main page and investing time/$$ into a mobile app might be too soon, especially since funding is tight.