Hi there,
Question 1): Is the best way of doing my titles, keywords and descriptions. Any concerns or recommendations. I have read, do not even use keywords anymore.
Agreed on the meta keywords tag - it is no longer needed.
There is some redundancy in the two tags at the moment. The primary rule is that you should be first and foremost writing for people, not search engines. You'll naturally include the keywords search engines need to see if you write for people (check afterwards to ensure you have, but good usability very often translated to good SEO):
**Suggestion **for a page about the Chateau Alta Vista:
<title>Chateau Alta Vista Cabin, Big Bear Lake, California | Big Bear Cabin Rentals</title>
There is no need to repeat the location / site name.
Chateau Alta Vista is located on Big Bear Lake, CA and is available for weekend breaks or longer stays. Space for up to 14 guests, 4 bed, 3 bath. Internet and hot tub provided.
There is no need to use keywords in a meta description from a ranking point of view (they do not influence rankings), but users should get a good idea of what they're going to find when they click through from the meta description. Think of it as free advertising space.
The photo pages should be fine, but consider including these in a larger page about the cabin itself, i.e. adding value to the cabin pages rather than creating new pages, similarly to how property websites show 8 - 10 photos of a property they are selling or renting, e.g. http://www.zoopla.co.uk/for-sale/details/33290790. The slide show takes precedence here whereas yours would probably not (lower on the page or in another tab), but see how they have used tabs to go between content, rather than create new URLs / pages - all the content is stored on the one URL about that one property.
If I do change the page names I will lose the history of property_detail_V.aspx which only has a Page Authority of 21, but if I change the page name and dynamic navigation of my website will I not lose all my authorities, if so, is it worth doing it?
If you 301 redirect between the old URL and the new one, the majority of the authority of the old page will transfer to the new one. Having said that, you only want to go through a lot of 301 redirects (NOT 302s! They pass no authority) if you really have to. Modern search engines are far better at dealing with dynamic URLs than they were years ago, so it is really hard to say if doing this would be beneficial enough to outweigh the fact that you need to go through redirects from the existing URLs.