I have a 5 night whirl wind visit to Iceland scheduled for mid October and am hoping to receive some advice from those who have knowledge of the island. It is going to be a self guided photo tour and the first three nights motel are reserved in Reykjavid as part of the travel package purchased. I'm thinking spending the arrival day on the Reykjanes Peninsula, the next day at Snaefellsnes Peninsula, the next day at the Golden Circle and possibly Kerlingarfjoll before returning to Reykjavid for the third night. I have purchased the map and eBook from the International Photographer as noted in another thread on this site and will work out the details to these areas soon. Does this sound reasonable to do in the time I have?
Following those three nights, I have two nights unreserved. I'm thinking heading to Skaftafell (Svartifoss is a must see for me) and Jokulsarlon (about 5 hours from Reykjavid). Probably drive part way back to a motel after dark. It's a long day, limited time. Any suggestions on a motel out that way? Am I trying to fit too much in or going too far?
Then work my way back to spend the day around Lakagigar and Landmannalaugar areas. Any hotel suggestions there?
Finally I will finish up in that area and head back to the airport.
I know I only have time to hit some highlights and can't spend much time at any one location, but it's better than not going.

There truly seem to be too many "must see" locations to cover in the time I have.
Any tips on car rental would be appreciated as well. I understand 4 wheel drive is required to travel on "F" designated roads. Should I reserve a rental at the airport or take the free shuttle to the hotel reserve a rental in town?
Weather wise it is usually 35 to 45 degrees that time of year. Sounds like snow is a possibility I should plan for.
I appreciate the information shared in this community and hope some of you Icelandic travelers will share your knowledge with me.
Miles