I'm definitely not one to run through the whole game in one sitting.
The threads might be a bit crazy if there is a bird watching thread, wildlife on wildlife takedowns, fishing thread and maybe fish tanks in the safehouse, good & bad daily diet thread for Jason and Lucia, spotting various species of reptiles, NPC watching, (if there's such a thing)in-game celebrity spotting, etc. Might there even be insects that interact with the characters?
Watching the trailers a few times and seeing the old man watering his lawn. Could we even plant seeds and grow things or have flowers and watch them die? It's going to be interesting to see how much detail R* incorporated over the list that was revealed.