Vancouver: Best Places to eat (not super expensive) in Vancouver?
Put Vij’s on your list. Indian food like no other. It's in the South Granville area and has been featured on an Anthony Bourdain show. The lamb popcycles are on the "must try" list.
Singapore: where to take a side trip from Singapore?
Try Kota Kinabalu. Off the regular tourist path, but plenty to do for 2-3 days and quite inexpensive. Also, there should be plenty of direct, inexpensive flights. Climb Mt Kinabalu, the highest mountain in South East Asia.
Germany: 4-5 day road trip near Frankfurt?
I think both Cologne and Koblenz are worth more than one day each. From Koblenz, take the train up the Moselle Viaduct and there are also so many great villages nearby on the Rhine River....