Fremont Street is old Vegas. The hotels/Casinos are close together so not as much walking is involved.
There is definitely a more varied clientèle on Fremont Street. (Down and outs, hookers, e.t.c. plus your average tourist.) We always go at least once every visit, because you can guarantee a good time in any of the Casinos on Fremont. The drink prices are more reasonable and the food choices are excellent value for money.
I would recommend the Fremont Seafood buffet, California's coffee shop and Main Street Station buffet for all meals. There are also a few free WiFi areas downtown. MSS has one in the player's club area, Fitzgerald's is in the McDonalds area and golden Nugget is in various places around the property.
hope that helps.