NM: our office frequently gets sent discount coupons for amusement parks here and in LA. I have two 50% off Legoland admissions, but unfortunately they expire Dec 31. Sometimes local grocery stores have promotions too. If you email me closer to your arrival date I'll see what I can dig up.
And as far as the weather, it definitely won't be poor here mid-May. Rains and our "cold" are gone by then.