Hi grytviken,
The max group size is between 30-35 depending on the date, however we currently have 19 people on our first July date and 13 on our second July date, so these may not be fully booked.
Yes, please give us a call if there are optional excursions you're interested in, but if you book you'll also get details of these and how to arrange in your customer documents.
Many thanks,
Vickie