Mother Daughter trip recommendations

Recovering from a recent divorce. Want to travel somewhere with my teen. Which places would you recommend for May last week? Good public transportation, good food, safety, easy to navigate with no/low language barriers would be our criteria. We have about 8 days. Thinking of Portugal - Lisbon, Sintra, Porto or Toronto. We are well-travelled; been to most national parks and us cities, all of west coast, most of Canada except Quebec City, Montreal, Toront, most of West/South Europe except Portugal, Central europe, Japan, Carribeans etc.