Old 80's 90's kids movie, help me find it please?

so i remember this old movie i watched as a kid, (its completely real life and not cartoon) where theres a girl in a red dress (there mightve been a boy as well im unsure) and theyre in their room, and eventually theyre somewhere else, and they have a picnic or something ? and theyre in a cave because its raining... show more so i remember this old movie i watched as a kid, (its completely real life and not cartoon) where theres a girl in a red dress (there mightve been a boy as well im unsure) and theyre in their room, and eventually theyre somewhere else, and they have a picnic or something ? and theyre in a cave because its raining so they start singing the rain rain go away song and i think they also sing the itsy bitsy spider song but im not sure, maybe

please help me :(
i remember it being colorful
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