Use the kits when walking around taking night shots since you can open it up to f/3.5 to let some more light in, especially for handheld shots. But for those type of shots and even dark rides pictures you will want to pick up something that opens to at least f/1.8, you can find some cheaper 50mm and 35mm primes lenses that would be perfect. Also pick up a sturdy tripod then you can take some night shots with the lenses you already have since you will be able to slow the shutter way down and not really worry about the F stop so much.