First of all thank you very much for using the plugin and for all the appreciations.
Please find the answer to your queries below:
Query #1: To display trips in the front page as you have mentioned, you need to the widget “WP Travel Featured trip”, “WP Travel Sales Widget” and “WP Travel Trips by Location” in the front page widget area.
Query #2: You will able to display the contact form in place of the default booking form by using the addon WP Travel Utilities. This addon comes with lots of exciting features and adding custom booking form is one of them. To know more about the feature please refer to below given link of our official documentation.