I would write a few tips on North Sikkim Trip.
1) Don't Hurry through the trip. You can't reach North Sikkim in a day from NJP/Bagdogra/Siliguri. You need to start from Gangtok, Mangan, or any place closer to North Sikkim.
2) Plan a 2 nights trip or preferably 3 nights trip for Lachung and Lachen. But if you want to skip Gurudongmar then a day or two at Lachung will be nice.
3) The hotels are of varied range in this hamlets, but mainly basic types. Choose the moderate type of hotel preferably. You will need provisions of hot water i.e. geyser and an electric kettle.
4) Powercuts are very common in those areas. Carry your power bank and get it charged regularly. Electronic gadgets like mobile phones and cameras tend to rapidly drain once you are at a high altitude.
5) There are no towns in North Sikkim, so carry all your medical necessities with you. There are high chances you will not find any shop there.
6) Everything is overpriced and you need to accept that ( no use bargaining)
7) Very basic food is served in the hotels like bread and jam, momo, maggi or egg curry and rice. Trust me, that's actually all they have.
8) You will not find decent toilets on road. And disposing any kind of sanitary product will be difficult.
9) You can have shared car facilties or private . Do not carry too much luggage one or two bags per person is fine.
10) Decide beforehand what do you want to see, like snow or flowers or apples , you can't see all of them together. Once you know your interest, then you can decide the season. We visited in the last week of March and everything was snow covered.
11) Do not opt for very budget hotels or cars they may be bad enough to spoil your whole trip.
12) Carry cash or opt for BHIM or something . Using card is not an option. carrying cash is the best.
North Sikkim Trip can be a Mini Adventure For You. Just keep in mind. you should choose the right partner and the right time.
:-)
You can Visit the link below for Gurudongmar Details
https://thetraveltellerstales.blogspot.com/2021/04/gurudongmar-lake.html