thanks for the helpful answer, although i'm sure i could have done that myself. was kinda hoping for maybe a local or someone who has been to the area to comment on how easy the journeys are. its all very well seeing it written in instruction form but actually doing the journeys are completely different.
Padstow is about 40 miles from Downderry, across country - so it will probably take the best part of an hour.
The Eden Project is about 30 miles from your chosen place.
I'm not a local either - and so I don't have a clue where Downderry is. Just found it by searching - the same as others do.
Downderry is not far from Looe. To get to the Eden Project probably about 45 minutes and 1 hour to Padstow, depending on the time of year. If its during the Royal Cornwall Show days a lot longer.