Return 3 closest locations to a users location (geolocation) and list those locations for them

Return 3 closest locations to a users location (geolocation) and list
those locations for them

Background:
I am working on a website/app built with HTML/CSS/Javascript that will use
geolocation (Google Maps API) to find a users location (geolocation) and
return them, for example, the top 5 closest water parks to them at that
location they are currently at so they will be able to then navigate to
one of those locations. I am using Google Fusion Tables to return the
results to them.
Question:
I have been able to successfully...
Find the users location and put a marker there (using Map API/geolocation)
Return 3 out of 5 locations and put markers down for those 3 (I used
Fusion Tables & limited results to 3)
I want to be able to…
Return only the 3 closest locations to the user (i.e. calculate distance
from users location to nearest water park)
Put a "sidebar" or list of those 3 locations, detailing name, address, and
other fields in my Fusion Table
I made a Fiddle below this code with what I have so far. The code below is
my Fusion Table query, which I assume is what I will need to make the
changes to in order to get the 3 closest locations (question #1). Question
#2, listing those locations, might use all of the code I have in my
Fiddle.
var base_query = {
select: 'Location',
from: '1MsmdOvWLKNNrtKnmoEf2djCc3Rp_gYmueN4FGnc',
limit: 3
};
var ftLayer = new google.maps.FusionTablesLayer({
map: map,
query: $.extend({}, base_query)
});
var infowindow = new google.maps.InfoWindow();
var marker, i;
for (i = 0; i < base_query.length; i++) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(base_query[i][1],
base_query[i][2]),
map: map
});
google.maps.event.addListener(marker, 'click', (function (marker,
i) {
return function () {
infowindow.setContent(base_query[i][0]);
infowindow.open(map, marker);
}
})(marker, i));
};
var signChange = function () {
var options = {
query: $.extend({}, base_query)
};
};
http://jsfiddle.net/jamez14/bRLaH/1/
Any help would be appreciated. I have been doing research on this question
for some time, but for whatever reason I am not able to piece it all
together. Any help/resources would be greatly appreciated!