lovely idea, I have a few suggestions,

> pose for a still life class- yes naked
>take up t'hai chee, or th'ai qwondo, or judo, or key
>arrange a room in the house differently
>set a new fitness goal, like run the new york/London marathon
>go to the beach, collect drift wood come back and make a mobile out of it- give it to some one as a present.
>Volunteer to go work in a youth club for a bit
>try making a new pair of trousers for urself
>try to find a low carb recipe of something ur mum used to make/ a cake /dessert that u love- cook it, then share it.
>have a big party at ur house and invite everyone u know
>buy a homeless person a sandwich and a cup of tea.
>make a new top for ur garden table using mosaic technique
>make ur own scarecrow
>start a compost heap
>Go for a run out doors at 4.45am, it's beautiful!
>learn to surf
>start a collection
>buy a massive trampoline and put it in ur back garden, get on it and BOUNCE- so much fun

Oh man the possibilities are endless, I hope I didn't repeat what anybody else put!
Good luck filling ur life with new experiences, an inspirational thread which has proven very popular