your hotel need not be at Gare Part Dieu, since this station is well serrved by the urban transport system operated by TCL - see http://www.tcl.fr/site/00_plans_reseau/pdf/met ro_tram.pdf
fares are EUR1.50 & are valid for 1 hour from issue.
Thanks for your replies. The problem seems to be that every hotel in Lyon is fully booked for tonight. Tomorrow and Saturday are no problem - it's just tonight.