"Counting down the days until we are back adventuring in my favorite spot in the whole world!!" Nikki captioned the video, which had been captured by a drone.
Nikki recalled of the experience, "We got up at 3:30 and headed out to Alberta Peak so that we could hike to the top by sunrise. It was already one of my most favorite hikes in Pagosa, but this experience made me fall in love with it even more."
"We reached the trail head at about 4:30 and started the trek up. It was pitch black and we had to wear headlamps to be able to see the trail, but the full moon helped and was also more than beautiful," she wrote.
"It was dead silent other than our footsteps and heavy breathing, and there was not a soul in sight. When we reached the top we were excited to be the only ones up there."
Nikki continued, "That on top of the world feeling was absolutely unreal! We hadn't really used the drone a whole lot before, and the wind made it pretty challenging. Also, after being strapped to the backpack on the hike up, the battery was too cold and being glitchy."
"We were so nervous it was gonna fail or catch a gust of wind and crash over the peak! (so take it easy on the drone footage criticism)."
She concluded, "All in all, that was one of the top 10 best days of my life and I wanted to finally share it with all of you. And if you ever get the chance to #visitpagosa I highly recommend it. I LOVE YOU COLORADO!"
The pediatric nurse had also stopped following Tyler on Instagram, and the last photo with him on the social media platform dated back to January 2018.
However, a man that appeared to be Tyler was visible in the background mirror of a photo Nikki had posted in July 2018 showing off her outfit in a hotel room bathroom during a trip to Las Vegas.
Nikki also wasn't wearing her wedding and engagement rings in subsequent pictures.
Tyler's Instagram is set to private now, but the last documented photo he had posted with Nikki was in February 2018, when he captioned a series of photos, "Such a babe... happy V-day" on Valentine's Day.
Nikki and Tyler got engaged in January 2016 during a snowboarding trip the pair took to San Juan National Forest in Pagosa Springs, CO.
Prior to getting romantically involved with Tyler, Nikki endured a highly-publicized and criticized relationship with Juan Pablo following the finale of The Bachelor's 18th season in March 2014, which featured an anti-climactic ending in which Juan Pablo told Nikki, "I like you," and offered her nothing but his final rose.
Rumors swirled at the time Juan Pablo couldn't communicate his feelings for Nikki and allegedly used her for the fame of their celebrity pairing.
"I knew I was never going to be the No. 1 priority, like, he has a daughter. But I mean, there's a difference between being the second priority and the seventh priority. We're just different people and... we just never saw eye to eye on [things]," Nikki told Chris Harrison back in January 2015.
"It's not from a lack of trying on either side. I tried really hard and he tried hard too... It's just, I'm a nurse in Kansas City and he lives in Miami, and he's in the entertainment industry... It was just really hard for me to fit into that."
Many The Bachelor fans strongly disliked Juan Pablo during his season for how he treated the women, and those negative opinions spilled onto Nikki for choosing to be with him despite those obvious flaws.
"No one prepares you for what's going to happen on the show and being in the spotlight... I wanted everyone [to] be happy for me, and I felt like [our situation] was misunderstood for a lot of reasons... the hurtful things that people said to me, it's just no one can prepare you for that," Nikki added in the interview with The Bachelor host.