Hello Sabha.........Late last year i cycled from Seville and did stick to the Camino ( difficult in places ) but to answer your question i cycled to Castilblanco from Seville on the camino via Guillena . The track along the river out of Seville is a bit lonely but a lovely flat start to your pilgrimage . There is nothing to be concerned about on this track...a few barking dogs in a run down farm/building after a couple of kilometres , but thats it really .There is a track after guillena that i needed to push my bike uphill and over some rocky ground but , Seville to Casilblanco is easy do able in a day even for an old boy like me
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I had to abandon my pilgrimage in Salamanca because of a back problem but in a couple of weeks i will be going back to Salamanca to continue my ride .........i can't wait .
Regards ....John