This is a 4 legged trade using the April options in which you buy a call spread and buy a put spread.
Specifically I want to buy the 380/420 call spread and buy the 380/340 put spread.
You are paying a net debit as of right now of around $24 and since the strikes are 40 dollars apart thats the most the position can be worth at expiration on Friday. So a potential 66% return in one day is what you are looking for as a best case.
The max loss occurs at 380 at expiration where you can lose your initial $24. But the probability that GOOG stays at 380 or anywhere near there is slim to nil.
Breakevens on each side occur at 356 and 404.
If you think GOOG will not break thru that range then you can narrow the strikes you use and increase your profitability range.
One thing to note is that you want to initiate this trade when the stock is close to 380, or else adjust the middle strikes to the current stock price.