Hi Phil,
I like the song and the sentiments behind it. My only niggle is that the chorus is likely to be longer than the verse, meaning that when its put to music there may be an imbalance between the two, suggesting that the arguments are really minor and the majority of the time is spent in the sun. This may be what you are after. Unfortunately the verses may appear trivial and all the meat is in the chorus. To avoid that you could just do an out and out love song and put the arguments in the bridge.
Alternatively you could expand the negative verses to give them more weight musically so that the chorus comes as a relief and a reaffirmation of your relationship.
I may be barking up the wrong tree, feel free to ignore what I've said if it doesn't fit with your idea of how the song should go.
diadem