Hi @Georgie,
The dataset used by the InVEST recreation model is indeed based on Flickr data between 2005 and 2017, and it is not currently possible to use other data sources, though I know our Recreation modelling team is looking into other possibilities. I would suggest trying out the model and seeing how it compares with what you’d expect.
After a quick search through the forums here, I also came across this post from @dave that you might find helpful:
Let us know if there’s anything else we can help with,
James