neonkitchen

hi everyone,
would love to get some input from people who have travelled to europe solo. especially women.
im heading to london in may. (for 3 weeks) planning to spend most of my time in london and paris..and probably barcelona. can anyone suggest good ways to meet people, not be lonely etc?
im not really a tour-person. but can anyone reccomend good tours, group activities...or other advice on connecting with people?
thanks!