Six years after they first walked down the aisle, Dr. Jennifer Arnold and Bill Klein of TLC's The Little Couple renewed their wedding vows in a April 27 ceremony on a beach in Galveston, Texas, surrounded by 50 family and friends – completely planned down to the last detail by Klein as a surprise for his wife.
"It turned out great," Klein tells PEOPLE. "She was so surprised. It has been a crazy year, good and bad, and we came out unscathed. I really wanted to make it happen and do something special for Jen."
The couple were hit with scary news last year when Arnold was diagnosed with a rare cancer and had to undergo intensive chemotherapy treatment at the same time they had adopted their daughter Zoey, 2, from India.
She joined son Will (who just celebrated his 4th birthday), at their home in Houston. (Arnold is now in remission.)
"Oh my goodness, I was very, very surprised," Arnold says about the plans Klein had made for the ceremony. "It was wonderful … more beautiful than I could believe. Being on the beach and having the kids there, it was definitely different this time around."
Klein launched his plan by getting down on one knee and proposing to her again, and, the next day, she was shocked that he'd gotten all of their friends and family to the beach for the ceremony.
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"This time around it was about taking care of Jennifer," Klein says. "And even though she found out about it last minute, she came up with better vows than the ones I wrote."
Another thing different this time around was having their children and those of their friends at the ceremony. Klein organized a kid station at the reception with mini corn dogs, chicken nuggets and a cupcake-decorating area.
"Bill took me completely by surprise and it was in a good way," Arnold says. "I don't know how he got all of our family and friends there. It blew me away."
The couple's vow renewal will be featured in the season finale on June 17.
In an exclusive sneak peek of Tuesday night's episode on TLC at 10 p.m. ET, (see video below), Arnold and Klein share a fun moment together with their kids at a local park, where Zoey shows how much progress she's made since first coming home.