For my tour business, I used Squarespace and registered the domain name through them. It has a variety of templates and styles, so all you have to do it choose a template for a free trial and add your content to see what it will look like.
As for third party booking systems, the one I use for my tours doesn’t work well for booking rooms or homes for short term rental, so my experience with booking systems isn’t relevant.
For accepting deposits I use Square because it allows me to invoice clients by email with a link to Square’s payment system.