Hi Mongstone,
Unlike Dynamics entity records, these activities are saved in Insights data service,
if you want to see marketing form submission activities and visit activities, you can find them in Marketing form > Insights:
submission

visit

if you want to see marketing email delivery activities, you can find it in Customer Journey(which you use it to send marketing email) > a marketing email tile > view details

then you can see all marketing email activities during a specific customer journey.

Obviously, you can also view from the perspective of contact or lead.

You can find all entities which are supported to marketing activities here.
So please assign necessary privileges on those entities: marketing email, marketing form, customer journey, contact and lead for your sales team.
To analyse these activities, you can connect marketing application to Power BI or export them as csv file with new feature in 2020 wave 1 release.
Regards,
Clofly