DS2 will be 4 in November. atm (being holidays) it's not quite his "usual" day (and he shares with his brother which can affect waking/sleeping times).
BUT - generally they come downstairs at 8am (although they've often been awake earlier) (I'm already up with DS3) as I'm usually half zonked out on the sofa feeding DS3 they play together doing jigsaw puzzles, colouring or boardgame.
Then they have breakfast (term times 8am, holidays 9-9.30am, DS2 snacks ALL day, EVERY day - he eats about twice the amount that DS1 does . When the weather is nice they're both kicked out into the garden - sometimes DS1 comes in and entertains himself but DS2 will stay out there. Inbetwee whiles he likes to help me with the washing, tidying etc.
Lunch is at 12(ish). Then atm I have to confess afternoons are spent with DS1 and DS2 entertaining themselves on the PS2 . Normally though DS2 would play with the toys in their bedroom, or we still go to a toddler group where he's got lots of friends. Dinner is around 6pm(ish).
They usually come off the PS2 around 4pm (or if I'm feeling extra lazy just before dinner is ready ). they both tend to amuse themselves really...
DS1 goes to bed at 7pm, DS2 at 8 (yes I do mean it that way round LOL).