Best time to plan a honeymoon trip to Assam is within November to May because at this time you can find relaxing weather in Assam, due to the cool breeze coming from the himalayan sides of Darjeeling, Arunachal Pradesh and meghalaya. These breezes also reduce the required temperature of Assam at this time and allows its tourists to perform all their adventure and thrilling activities.

Peoples of Assam celebrate the festival of bihu three time in a year, even they have a separate name for each of them like ‘Bohag Bihu’ which is celebrated in the month of Bohag (mid of April), Magh Bihu which is celebrated in the month of magh (mid of January) and Kati Bihu in the month of kartik (mid of october).

Couples can perform a lot of activities to make their honeymoon trip special and memorable, some of them are as follows;
Participate in a river cruise: one of the biggest rivers of Assam named as Brahmaputra  allows its visitors to do a river cruise in it. You can even select a cruise according to your need from different-different types of cruises like dinner or other included facilities.
Explore Wildlife Sanctuary and parks : you can explore and witness enormous numbers of plants and animals in Assam at places like Kaziranga National Park, Manas National Park, Orang National Park etc.
Witness the traditional festival of Assam: one of the best festivals to witness in Assam for newly wedded couples is Bihu where they can see a beautiful traditional folk dance, culture, customs etc of the locals.
Do adventure things: You can find lots of water-bodies in Assam where you can do lots of water-sports like boating, fishing, Rafting etc.

Some must performing activities for honeymoon couples in Assam are given below 
Wildlife tour at kaziranga: Honeymoon couples are strongly recommended to do an elephant safari and a jeep safari at Kaziranga National Park to observe various endangered species.
Rafting: Couples can do this crafting activity over the high tides and currents of rivers that flow through assam. It is also considered as an excellent activity to perform with your beloved partner.
Trekking: Couples can  do this trekking activity around the Lilabari Town and Adamail region due to their beautiful landscapes and mixed lands.
Camping: one of the best things that Assam is providing to honeymoon couples is a camping activity in the middle of natural settings near Lilabari. Couples will love to spend  a night under the sxy that is full of twinkling stars during their camping and mesmerising views of himalayas.

Some best places recommended for honeymoon couples planning a trip to Assam are:
Kaziranga National Park. Containing the ⅔ of total population of one-horned Rhinoceros
Majuli Island. One of the biggest islands located in a river with a mass area of 352 square Km.
Haflong Lake. Haflong Lake is situated at the centre of haflong city and one can enjoy the scenic views of mountains while boating on it.

Yes, for honeymoon couples Assam is going to be the best place to plan their honeymoon trip as they can find here many wildlife reserves, natural attractions, local heritage, a different culture and custom etc which makes it different and attractive to its visitors.

Yes, Assam is totally safe for honeymoon couples and there is only one thing which becomes troublesome that is the flood. Sometimes during monsoon season due to heavy rain most of the areas of Assam get affected with the flooded water.

A maximum of 6-7 days are required to explore all the famous places of Assam because all the sites and places are situated at a great distance from one another. So it is advised to plan at least a 6-7 honeymoon trip.  

Some of the well-maintained and beautiful resorts for honeymoon couples are given below:
Resort Borgas
Aarian woods resort
United 21 Grassland Resorts
Brahmaputra Jungle Resort
Zizina Resort

In Assam, the rainy season starts from June and lasts till the starting of october, at this time the weather condition is quite favourable for water-sports.