Hey I noticed tonight's masterclass is about healthy/fitness family activities (ie *puts on a stage voice* Your wish is granted!!!)

Perhaps you could meet the ILs out in a park - and WALK somewhere to get your coffee. Something local is a good idea, because if the excursion is a success then that's a good excuse to go there again.

As to how to get them there - tell them your doctor said you have a Vit D deficiency and you have to spend more time out doors.