You can get the URL of the info page pretty easily. Like TreeUK initially suggested, use the local search API, and upon its completion, you'll have access to yourSearcher.results. For each one, just grab result.url (or yourSearcher.results[i].url to be more precise) to get the info page.
If you want the direct link to the reviews page, modify the result.url a bit...
var baseUrl = 'http://www.google.com/maps/place?';
var cid = result.url.match(/cid=\d*/gi)[0];
var reviewsUrl = baseUrl + cid + '&view=feature&mcsrc=detailed_reviews';
...then do what you want with reviewsUrl.
If you want more reviews, add the num (and optionally the start) parameter to the query string:
var reviewsUrl = baseUrl + cid + '&view=feature&mcsrc=detailed_reviews&num=100&start=0';
So, really all you need is the cid. Once you have that, you can get at any of the other info.