Yes they are tuned wierd, opposite of guitars. While guitars are tuned in 4ths, all the string instruments except the double bass (which have the same tuning as a bass guitar) are tuned in 5ths. Violins are lot to high GDAE, violas (are like baritone violins) CGDA (just missing the high E), the cello is an octave lower than the viola (CGDA) and the Bass is the following E below the Cello's C (EADG).
I bought a violin and pulled the strings off of it and then couldn't to afford getting a new set as they are expensive, but it was fun. I found the violin pretty hard although I can pick up a double bass and play it picking with my fingers relatively easy. IME the bigger the instrument is, the less sensitive the pitch sensitivity is making it easier to play in tune.
Personally I would go after a cello as it generally does better by itself, its a very middle pitch instrument, not extremely low in pitch and can still sing some nice high notes.