I really liked your suggestions. There are some I wish to elaborate more:
marketplace (and economy in general): I would like if there was something like that between players, but I understand why it's a slippery slope and the developers need not to afflict the whole game economy. High level players could easily buy espensive gear and resell it to low level players at ridicolous amounts or do the opposite, buying low level gear from low level players at huge rates to feed them silver, which is to be avoided. One solution could be to just sell back the used gear at very low price to the marketplace (basically, what happens in RPGs when you're selling looted stuff at low levels ), kind of 10-15% of the original price, or less if the gear is broken or worn out: players could get rid of old gear and get some small money back, maybe not enough to buy that 20000 silver reel, but still enough to help. Furthermore, it would be great to be able to sell (and thus buy) items crafted by players, maybe at fixed prices depending on the quality etc. Lastly, it could be great to "recycle" old gear, accordingly with your crafting skills, to get spare parts and/or raw materials from that broken reel
food: a "well fed" bonus working like the "tipsy one" would be awesome.
Rod pods: would be great, as well as adding more rod holders to the boats especially for float fishing or some bottom fishing tecniques. They might come also as accessories which don't come with the boat rental but must be bought at the shop.
I know I somehow "limited my dreams", but I wanted to give suggestions that in my opinion could fit with the game philosophy, hoping they would be accepted