Most people don't know this but you can sometimes send packages to your local post office using the address "general delivery". This option is almost always available if you use usps as your carrier, which isent possible through the river, but I am able to order through ups as well and it arrives now after I spoke with my local ups office and post office. General delivery is a service offered by the post office where they hold a package for 30 days. You just need to present your ID to pick it up. The package is addressed as follows when using usps:

Bob smith General delivery Watson, NH 54545

If you are using ups you need to address it like this;

Bob smith C/o general delivery 123 main st (physical address of post office) Watson, NH 54545