My son is an avid Giants fan and we plan on coming to the city for two games so we would be there for 2 nights probably.  I'm a little bit familiar with the area but it was from 20 years ago.  

Any recommendations on a hotel near the ballpark (under $300 per night if that's possible) and things for us to do while we are there would be greatly appreciated.  Could be June, July or August at this point as we have not decided which games to attend.

Cable cars!  Gotta ride the cable cars.  Not sure the best one but kind of think a later ride might be less crowded.  Lombard Street.  Day time view and experience, as with cable cars, is better but summer tourist time, evening might be less crowded.  Note that if you turn right at the bottom and try to follow that street, you will find some very steep slopes and interesting intersections.  Fort Point.  Golden Gate Bridge.  Explore some of the old coastal defense batteries, there are some on both sides.  There are a number of different historic old streetcars from various cities which run along the waterfront.Check out Golden Gate Park.  check the museums.  The kids might like the Japanese Tea Garden.  Traditional architecture and plantings but also interesting step stone and steep arched bridges over the waterways.

Go to Taqueria El Farolito in The Mission for a huge-ass burrito. Sit on the bus bench out front and devour it, while trying to keep the bag of chips from being blown away by the wind.

Muir Woods, walk out on the Golden Gate Bridge

Got it.  Thanks guys.   No sure which games yet, still in the planning stage.

Catch some road games! Don't spend a dime in that festering liberal pit.