Lisbon for four nights - day trips to Cascais, Sintra, Mafra
Rent car and go to Obidos, stay in Tomar (boys will love Templar activities), two nights, horseback riding
Coimbra one night
porto four nights - get rid of the rental car. Douro valley river cruise etc.
VRBO in Lisbon and Porto - seems like less $$ than two hotel rooms. Then hotels Tomar. Unless someone knows family stays? All hotels have just one bed or pull out. I have two big teenage boys who need their space!
Thoughts are appreciated! We enjoy staying in one or two places rather than constantly on the move. And trains except for a couple nights with car.