Possibilities depend upon his interests and your budget.
Everyone is different.
If he is into cars, then something from the automotive industry might be suitable. My daughter took me to the Berrings Black Hawk Auto Museum in Danville, CA for my birthday one year. It was really great. You could send him off to something like this with one of his guy friends if you can’t go with him.
If he likes sports, then you can get him tickets to a ball game. If you can’t go with him then send him off with one of his guy friends.
If he enjoys cooking on the outdoor grill or likes to do BBQ, you could get him a good quality grill, smoker, or set of accessories.
If he has a hobby there is usually something he would like to have that would serve to enhance that interest.
If money is no object and your husband likes watching sports etc on TV, you could always get him a large flat screen TV. Some people like TIVO’s. The new Blue Ray DVD players are another possibility.
If you’re really “loaded” you could go completely nuts and buy him the boat or sports car of his dreams.
Personally, I like the idea of a date night even if it’s at home. A great home cooked dinner by candle light with a glass of wine etc. would be real nice. Simply treat him like the man you love with all your heart.