I have been at this a while now trying to figure out the best way to set this up. I am trying to sell day trips or multi-day trips on my site. Right now on a display node I have a date field set up with repeating dates. Let's say this node repeats every weekday and is not available during the weekend.

The problems I am facing right now are:

1) How to allow users to pick a date from the available dates that gets passed to the shopping cart (better using a calendar system that can put [x] on blackout dates)

2) Have the shopping cart know if the date is available, and send back a message if it is not available or again using the calendar to give a clear [x] showing users they cannot select that day (preferable)

3) This would be great, if I could assign inventory on a daily basis for each trip. So for example a trip has 10 seats, and each day the availability would have to be refreshed.

A good example to reference would be http://www.viator.com/tours/San-Francisco/Beach-Blanket-Babylon-Show-Tic... as you can see once you select the date field a calendar pops out and displays the blockout dates easily.