Best way to set this up?

I am looking to use this system on my website to accept online bookings.  We run sea kayaking tours, with four doubles and four singles for half days and full days seven days a week and camping trips on weekends.

When a double or single kayak is being used for a half day it obviously isn't available to be booked for a full day or camping (and vice versa).  To further complicate things the single kayaks are often used on weekends for coaching courses I run.

I've had a little play and it seems that the system will do what I need it to but what's the best way to organise this?  

Thanks in advance,

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