Activities for first bday party??

My friend is hosting my daughters first birthday! Thing is there is no other kids going!! Well my 6 year old will be there and her teenagers who adore my kids.. but no one her age! I was thinking of getting a mini bounce house or a sand table or something for her bday gift and using it the day of.. we’re in Florida so it won’t be to cold and we will probably be outside.. the thing is the older kids might not want to play with that stuff.. what’s something I can get that she can play with along with the older kids?