"there was so much turbulence that we couldn't climb higher than the cloud level."
I doubt it. I have never encountered turbulence which has an average negative-performance effect (except a downdraft and you'd know about it if you hit one of them). The aircraft was probably flying at the flightplan altitude and couldn't get higher because of ATC. Remember, the "cloud level" on thundery days can be much higher than the cruise altitiude of a DH8.
"Plus I think the wing on top of the body design makes it less strong, I can just imagine the wings breaking off in really bad turbulence."
Please refrain from making comments like this which contain no factual validity. The wings of a Dash 8 are as capable of staying strapped to the fuselage in turbulence as those of a 757 or 747. The high wing does not make the aircraft less strong.
In response to the first question the DH8 is a great aircraft, as safe as any jet you might otherwise fly on, and the high wing and lower cruise altitude will ensure a great view from any window seat provided the skies are relatively clear. Enjoy your trip.
I used to love the smell of Jet-A in the morning...