Hi Lucinda
First of all, let me reassure you that you won't ever be left to sight-see on your own unless you want to. Most of our holidays include a number of included excursions, and whichever holiday you choose you will meet plenty of people in the same boat, with a friendly tour manager on hand to help make your holiday as enjoyable as possible.
As for telling which holidays have sold out, if you can see a holiday on the website, it will be available. Our system is set up so that when a tour becomes fully booked, it will disappear from the website - it's a big advantage over the brochures. At the time of writing there are places available on the Kenya and 5-day Toronto trips you mentioned, with two dates possible for each. Namibia is no longer available.
I'm very sorry that your previous tour was cancelled. I can assure you this is unusual so please don't be put off, as so many of our customers come back saying they have had the most wonderful holidays.
Kind regards
Olly, your editor