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Suddenly, I know the relative sizes of the planets!
HT Andrew Gelman.
ETA: Pluto isn't in the picture, but it would be a coriander seed, half the diameter of Mercury. For the Sun, imagine a spherical elephant.
The radius of the sun is only about ten times the radius of jupiter. I feel like a spherical elephant has considerably more than ten times the radius of a watermelon.
...is what I was about to say until I did research, and apparently it's pretty accurate. A watermelon can exceed 60cm diameter, and wolfram alpha gives an elephant's length between 5.4 and 7.5 metres.