Be it doing the flower arrangements, hanging the balloons, or taking up of more complicated projects such as swags of wreaths of flowers and foliage, if you have a fascination about them. Lay the table in good time to create a welcoming ambience for the guests. Make sure to plan the party according to the theme you've thought of. Decor and make a display of things accordingly. For summer fun, fasten beach balls together in groups of three or more using wire or tape or whatever, and hang them wherever you like.
Giant props are always fun.
For the same reason, when things are ten times bigger than they should be, people derive the fun from them. You can print out characters or images related to your party theme, cut them out, and attach them to the straw hats by making slits at the top and bottom with scissors. Or, tape them to paper cups, place cards, balloons, or banners. You can print out characters or images related to your party theme, cut them out, and attach them. Or you can use stickers.