Research the best keywords for your site. Look at what your competitors are using for keywords, and try a few keyword tools. Remember to target your audience and consider all the word that they will type into the Google and Bing search engines.
Sitemaps help Google understand how to crawl your site and how many pages your site has. Sometimes you can see some discrepancies between pages submitted and indexed, especially if you offer seasonal packages and count those pages indexed.
You should have a responsive site as all of your content should be mobile friendly. It should be checked out to make sure everything is working the way it should be.