go outside!!!
just go to get some books you always wanted to read, and sat down in a cafe, got yourselve a latte, open your brand new books... if u get lucky, some girls might approach you

well, anyway, don't put any expectation, jus treat it as a me& myself time.. and surf the net at starbucks or some place like tat...
when you get usual to the environment, you can definitely speak to someone seat beside you on the tram/buses/tube. sit down with someone and have a meal by sharing a table...
easiest people to talk to is people in the 'servicing line' waitress, promoters etc. ask for specials, free gift, just casual chat, 'how long you've worked here, am new to the town,. wil be starting my college on ?? etc... there're plenty of ways to make frens from all backgrounds and all ages...
well, if u r not picky on friends.. for me, i really enjoy talking and making friends with ppl from all sort of backgrounds, culture, ages...