Good to know that you already have visitors coming in. To make the most of your ad spend, given that you have a limited advertising budget, you should start advertising in websites like 123greetings.com, where the traffic is defined and advertising cost is low.
Advertising on search engines may not be a good idea at this stage, with a limited budget, and the cost per click would be really high for you there as the season approaches.
Take a look at the following links, that I feel would be good to advertise your travel options:
The traffic from the above will not be overwhelming, but you should expect a better conversion advertising here.
To sign up, use the following link:
For more information, please visit my pages on Yahoo and Blogspot or write to me.