Develop a consulting service that helps young couples start and run businesses together. Offer expert advice on how to manage both their personal and professional relationships, including tips on communication, delegation, and business planning. Provide resources such as business plan templates, legal advice, and marketing strategies. Additionally, consider hosting networking events where couples can meet and learn from other entrepreneurial duos.

Form an adventure club that organizes exciting outdoor activities and excursions for young couples. Activities could include hiking, camping, kayaking, or rock climbing, designed to strengthen the couple's bond through shared experiences. Offer memberships that provide access to regular events, and provide all necessary gear and guidance for each adventure. Promote a community atmosphere through social events and online forums.

Create and offer workshops that teach young couples new hobbies or skills they can enjoy together. This could include gardening, painting, pottery, or even musical instrument lessons. Focus on activities that promote bonding and teamwork, and provide all necessary materials and equipment. Offer both in-person and virtual classes to cater to different preferences and locations.

Host cooking classes that are specifically aimed at young couples who want to learn how to cook together. Classes can range from basic cooking skills to gourmet meal preparation, focusing on collaboration and teamwork in the kitchen. Offer flexible class times, including weekend and evening sessions, to accommodate different schedules. Consider adding themed classes, such as Italian cuisine, vegan cooking, or holiday meal preparation.

Start a home décor consultancy that assists young couples in designing and decorating their living spaces. Offer packages that range from complete home makeovers to specific room designs, tailored to the couple's tastes and budget. This could include mood boards, 3D renderings, and even sourcing furniture and décor items. Additionally, offer advice on how to merge different design styles and create a cohesive look.

Provide financial advisory services that focus on the unique financial needs and goals of young couples. From budgeting and saving for a home to planning for future children and retirement, offer comprehensive financial planning sessions that help couples navigate their finances together. Consider providing additional online resources such as budget calculators, investment guides, and financial planning templates.

Launch a fitness program specifically designed for young couples who want to work out together and achieve their health goals as a team. These programs can offer a combination of personal training sessions, group classes, and online workout plans that couples can follow together. Consider adding elements like cooking classes that teach couples how to prepare nutritious meals, and workshops on topics such as maintaining a healthy lifestyle and achieving fitness goals.

Develop and sell DIY wedding planning kits that help young couples organize their special day without the need for an expensive wedding planner. Each kit could include checklists, budgeting tools, vendor recommendations, and templates for invitations and thank-you cards. Offer customization options to cater to different wedding themes, whether it's a rustic barn wedding, a beach ceremony, or a chic city event.

Create a travel agency that specializes in planning romantic getaways and adventure trips for young couples. You could offer packages that range from weekend retreats to month-long holidays, tailored to suit different budgets and interests. Include options for booking flights, accommodations, activities, and even dining reservations. Personalized itineraries and surprise elements like unexpected romantic dinners or adventurous excursions can make the experience even more special.

Offer specialized relationship counseling services that cater specifically to the unique challenges and milestones faced by young couples. This could include premarital counseling, conflict resolution sessions, and long-term relationship planning. In addition to one-on-one sessions, consider hosting workshops and webinars that cover important topics such as communication skills, emotional intelligence, and financial planning for couples.