shermin,
since your son is amost 2.5yrs old now, can send him to playgroup or 1/2 day childcare already. i think he will enjoy it! my dd now 20.5mths old, can see some days she also bored staying home, so after she turns 2 i am planning to send her to PG or CC.
for now, i do alot of activities with her at home. play games, play toys, read books, sing songs, dance, watch dvds, she plays with baby/tod softwares on her laptop also (ie. sesame street, disney, pooh, etc). i also bring her downstairs every evening to the playgorund or park. sometimes in the morning/afternoon i also bring her to the shops, supermarket, coffeeshop, etc.
once she is old enough i plan to do arts & crafts and also cooking/baking with her at home. i already bought some books from amazon on these activities, so now reading up. so kiasu!!