Hi. covid situation is in control here in uttarakhand. No problem traveling within the state. My personal suggestion would be to avoid rishikesh and haridwar, as most cases are from these two places. apart from that, there's absolutely no reason to worry and you can travel happily and freely. 😊
If you got a day and like mountains then I would suggest.
Savanadurga
Skandagiri
Nandi Hills (Definitely for Sunrise) Or you can spend a day at Muthayala madugu. ( a jungle without wild animals) Bangalore palace There are so many parks to relax/go for a walk in Bangalore but not the ones that you find unique from the regular ones.
I have travelled to lots of places in South ( mainly Karnataka, Tamilnadu, Kerala), though not specifically in Summers. However you can visit some places like Chikmagalur, Kodaikanal, Coorg which are few of the best hillstations in south to visit during summer. There is also Dandeli, few kms from Bangalore, which is very good for water activities and apt in summers. Also please conduct your own research on temperature, weather currently before making any decisions.
With the second wave of covid, things have been very unsafe in Himachal. Cases are rising at an increasing rate. From 10 May proper lockdown is being imposed. I humbly suggest to sray at your homes in such times and take timely precautions to save yourself and your loved ones from this pandemic.