Boyriend Suprise Birthday

Hey
I was thinking about throwing my boyfriend a surprize party too. It is his 20th birthday. I was planning on calling some of his friends and see what they think i should do. I was thinking about having his clocest friends over like maybe 5 or so and have them all bring a date and i love to cook so i was thinking about having a dinner/ martini kind of party. I think it would be fun to have everyone dress up with their date. He has a vacation house on a lake nearby so i will probably have it out there. There are like 5 bedrooms there too so everyone will probably spend the night. I need some more ideas too so if you have anymore ideas send then my way! i hope my ideas helped you out a little... Have a nice day!