Goa is always a good idea!! but summer Months like April & May are too hot and humid. So better avoid if possible. Otherwise hangout only in the evening exploring forts & beaches and during day time enjoy your beer & read a book :)
Its summer hence crowd would be less. though u can have a great time there since many things will be cheaper at that time of the year. but the best time to visit is between November and February yet the pricings of beach activites and all of that would be pretty higher.