okay im going to do a mall scavenger hunt for my bday party any ideas?? im 13?

okay so what i was thinking is that like i could like have 11 to 15 ppl come to lthe mal nd we could first eat pizza then we could do the whole SCAVENGER HUNT thing. we dont have a lot of stores in our mall (its very little) but i was thinking that there would be two teams and then my mom wouldgive each team 15 to 20$ and we could buy a manythings as we coud with that. if we could get free stuff too we would and then whoever has the most things then they would win a prize any suggestions on the prize? then we would do cake and presents and then everyone would leave except for 3 other ppl and we would have a sleep over.

do you have any suggegtions on what we could do during the sleepover? and any help games or anything at all would help! thanks!! remember im turning13 july 27 next month and im going into 8th grade so please make them age appropriate! thank you (: