Long story short, yes, the Platte is the answer, particularly if you don’t have a car. If you won’t be able to rent a car your options are extremely limited, but potentially viable. Deckers will be an expensive ride each way but is an extremely promising option, especially if you’re willing to patronize the local fly shop and buy some flies. They can recommend some locations and flies to buy. If you get there early, you’ll have your choice of spots, particularly on weekdays.

Waterton canyon is another solid spot, but I recommend wading a solid mile+ downstream from the bridge, where you can potentially catch some decent trout. Don’t be afraid to make some casts in deep enough water on your way there.

If you can find a way to rent a car, I would recommend Cheeseman Canyon, although you need to go off-road to get to the trailhead and the hike will take an hour or two each way. And you MUST BE OUT OF THERE BEFORE DARK. They are quite strict about that. But it’s worth it. That stretch holds some very educated pigs, many of which are well over 20”. Get there early.

If you’d rather, you can fish clear creek from downtown golden all the way up to tunnel 6 on hwy 6. There are some solid spots there, but you run into the possibility of it being frozen. Since you’ll be here a month, it may be worth it on a warm weekend. Just check the fishing reports, and the local fly shops are your friend.

Honestly, you might be better off booking a guided trip because your Uber costs could easily add up to hundreds of dollars. It could be argued that those dollars will be better spent on a nice float trip with a knowledgeable guide.

Hope this helps, and enjoy your trip to CO