Don't have much idea of the geography but can someone suggest the best base (or bases) for exploring Zion, Bryce and GCNP. What is the difference between north and south rim of GC? Which is better? We will be travelling in summer with 2 kids 9 & 12. Will be travelling from Vegas in hire car and planning on a week - 10 days. How long should we spend in Vegas as opposed to the parks. We aren't gamblers and prefer nature but would be interested to see the neon of Vegas briefly. Would mid July or August or early Sept be better or would all be HOT. Have read lots of great entries so far - thanks everyone.