These hikes are close together in Central New Hampshire. I was able to see a variety of environments within a few hours, including bogs and mountains.
The first stop was Esther Currier Wildlife Management Area. There are two parking spots, I chose the one on Mountain Road. The trail is fairly short, out and back, trail with almost no elevation gain, it takes about an hour to walk the trails but you may want to allow additional time for observing wildlife or sitting in the blind waiting to see what comes to the water. These are several lookouts onto ponds and wetlands, one includes a blind. I arrived fairly late (8 am) and did not see any mammals other than rodents. I would recommend arriving earlier if searching for larger mammals (Others reported seeing moose there). I did however see some pink lady slippers and some bog plant species.
The first stop was Esther Currier Wildlife Management Area. There are two parking spots, I chose the one on Mountain Road. The trail is fairly short, out and back, trail with almost no elevation gain, it takes about an hour to walk the trails but you may want to allow additional time for observing wildlife or sitting in the blind waiting to see what comes to the water. These are several lookouts onto ponds and wetlands, one includes a blind. I arrived fairly late (8 am) and did not see any mammals other than rodents. I would recommend arriving earlier if searching for larger mammals (Others reported seeing moose there). I did however see some pink lady slippers and some bog plant species.
The next stop was Philbrick-cricenti bog. This is only a few minutes from Esther Currier. It's a nice black spruce bog with wooden boards for walking on. Please stay on the boards to avoid damaging the bog. Here I was able to see many bog plants such as pitcher plants and Azaleas were blooming, The only wildlife I saw was a frog, but I did see a footprint that looked like a bear. The loop is very short (under 1 mile). An hour should be long enough unless you're very into bog plants.
I made a quick stop by Messer Pond. It's not a very long trail (about 15 minutes) to a picnic table and a view of the pond. I saw a couple of garter snakes.
John Hay National Wildlife Refuge was the next stop. There is a day use fee to be paid in cash in the parking lot. The hikes go around the lake and up to the "Main House" which has hummingbird feeders, gardens, and bees. I believe it's around 2-3 miles in total with very little elevation gain. I would plan for two hours.
I saved the best hike for last, Winslow State Park. There are two ways up, I went up the Winslow (red) trail which is around 1 mile and 1,000 feet in elevation gain. You need to buy a parking day pass for this location which was 5$ although I believe discounts are available. This is a great short hike up to a wonderful lookout. The trail is a little steep but no climbing is required.